diff --git a/docs/TEST_INTEGRITY.md b/docs/TEST_INTEGRITY.md
index 8f75873..d09b695 100644
--- a/docs/TEST_INTEGRITY.md
+++ b/docs/TEST_INTEGRITY.md
@@ -2883,6 +2883,45 @@ test_integrity_note:
     if_true_explain_spec_basis: ""
 ```
 
+# Candidate source B2 frozen-input and fence boundaries (2026-10-01)
+
+```yaml
+test_integrity_note:
+  change_type: new_tests
+  scenarios:
+    - id: SCN-candidate-bootstrap-one-shot
+      given: "An issued, nonce-bound native admission"
+      when: "It is opened, replayed, expired, foreign, or malformed"
+      then: "Only one bounded private bootstrap opens; every invalid case refuses before child start and exposes no authority handle"
+    - id: SCN-candidate-input-consumption
+      given: "A frozen project-local source snapshot"
+      when: "The original source changes before the fixed Node child reads its cwd"
+      then: "The child observes the captured bytes; snapshot drift refuses"
+    - id: SCN-candidate-execution-boundary
+      given: "A fixed command and explicit bounded environment"
+      when: "Ambient PATH/HOME/cache fallback or output overflow is attempted"
+      then: "Execution refuses or remains non-success"
+    - id: SCN-candidate-fence-closure
+      given: "A private PID1 namespace observation"
+      when: "Descendant closure is absent or uncertain"
+      then: "The outcome is UNKNOWN/INCOMPLETE, never terminal PASS"
+  observable_outcomes:
+    - "No DB, ControlPlane, writer, receipt adapter, or authority FD reaches the child"
+    - "Product input links and special nodes refuse; frozen product S stays under 64MiB/file and 512MiB total"
+    - "Artifact output remains M/artifactManifest; receipt-adapter A is absent and unclaimed"
+  determinism_controls:
+    - "Temporary source trees, fixed Node executable, explicit empty ambient environment, bounded streams, and injected observations"
+    - "No live policy registration, installation, network, cache, or provider process"
+  anti_cheat_rationale:
+    prevents:
+      - "Reading mutated live source instead of captured bytes"
+      - "Replaying a private admission or relabeling fixture output as a receipt"
+      - "Treating PGID emptiness, zero exit, or Chromium metadata as descendant/binary proof"
+  relaxation:
+    did_relax_any_assertion: false
+    if_true_explain_spec_basis: ""
+```
+
 # Console attention advisory cohorts (2026-10-01)
 
 ```yaml
@@ -2932,6 +2971,47 @@ test_integrity_note:
     if_true_explain_spec_basis: ""
 ```
 
+# Candidate source B2 authenticated-attempt spec correction (2026-10-01)
+
+```yaml
+test_integrity_note:
+  change_type: spec_correction
+  scenarios:
+    - id: SCN-candidate-bootstrap-one-shot
+      given: "A CheckService-issued opaque registered-plan handle"
+      when: "A foreign, cloned, expired, replayed, or already-closed handle is used"
+      then: "No FD3 admission opens; the only accepted acknowledgement is the exact FD4 binding frame and it closes the original linear handle"
+    - id: SCN-candidate-input-consumption
+      given: "A frozen, bounded product snapshot and a fixed Node E binding"
+      when: "The original product bytes change before execution"
+      then: "An actual spawned child reads the frozen bytes; post-capture drift refuses before spawn"
+    - id: SCN-candidate-execution-boundary
+      given: "An opaque attempt with fixed command, arguments, explicit environment, and output cap"
+      when: "The child exits zero after exceeding the cap"
+      then: "The parent records overflow as non-success without accepting an injected executor or caller-selected limit"
+    - id: SCN-candidate-fence-closure
+      given: "A closed opaque attempt"
+      when: "The backend has not recorded namespace identity, FD closure, and descendant reaping"
+      then: "Terminal proof is UNKNOWN; fabricated observations and cloned handles cannot create proof"
+  observable_outcomes:
+    - "Only the exact FD4 acknowledgement closes a one-shot opaque admission"
+    - "Child stdout proves frozen-byte consumption, not same-process test reads"
+    - "Zero exit plus output overflow is never success"
+    - "Missing backend fence evidence is never TerminalProof"
+  determinism_controls:
+    - "Temporary source trees, fixed absolute Node runtime, explicit empty child environment, bounded streams"
+    - "No injected executor, caller-provided command, root, environment, limit, or terminal observation"
+  anti_cheat_rationale:
+    prevents:
+      - "Arbitrary tuple issuance or a fabricated bootstrap literal"
+      - "Boolean caller observations minting terminal proof"
+      - "Cloned or reused handles reopening an admission"
+      - "Same-process snapshot reads impersonating child consumption"
+  relaxation:
+    did_relax_any_assertion: false
+    if_true_explain_spec_basis: ""
+```
+
 # Compact Console Overview density (2026-10-01)
 
 ```yaml
@@ -3064,6 +3144,108 @@ test_integrity_note:
     if_true_explain_spec_basis: ""
 ```
 
+# Exact-source adoption (2026-10-03)
+
+```yaml
+test_integrity_note:
+  change_type: new_tests
+  scenarios:
+    - id: SCN-integration-adoption-private-ref-cas
+      given: "A clean disposable Git repository, a base commit, and an owner-bound private-ref adoption"
+      when: "The adoption finalizes and a stale compare-and-swap attempts to alter its candidate ref"
+      then: "Real Git private archive and candidate refs are created atomically, while the stale write refuses"
+    - id: SCN-integration-adoption-journal-and-binding
+      given: "A prepared adoption journal record"
+      when: "A second preparation or lifecycle request supplies a different candidate binding"
+      then: "The journal revision compare-and-swap and immutable binding checks refuse without changing the prepared record"
+    - id: SCN-integration-adoption-finalize-recovery
+      given: "A real private-ref transaction completed before its journal write"
+      when: "Reconciliation is run and then replayed"
+      then: "One durable finalized recovery is recorded and the replay is consistent without another mutation"
+    - id: SCN-integration-adoption-rollback-recovery
+      given: "A finalized candidate whose private ref was removed before its rollback journal write, or whose candidate ref diverged"
+      when: "Rollback is requested"
+      then: "The completed rollback is recovered once and divergent candidate bytes refuse"
+    - id: SCN-integration-adoption-private-ref-intake
+      given: "An existing unfinalized private candidate ref and a separate finalized owner-bound private candidate ref"
+      when: "Direct private-ref intake and authenticated native qualification are requested"
+      then: "Direct intake refuses without a queue record, while the authenticated path records the exact private ref and commit in ordinary testing state"
+    - id: SCN-integration-adoption-approval-boundaries
+      given: "An ordinary source-only approval, or an adoption whose actor, action, approval revision, or provenance differs from the approved immutable binding"
+      when: "Preparation or a lifecycle transition is attempted"
+      then: "The transition refuses with its structured boundary code and no integration queue record"
+    - id: SCN-integration-adoption-request-replay
+      given: "A finalized adoption that has created its one ordinary private-ref integration request"
+      when: "Two independently opened authenticated API callers request it concurrently"
+      then: "The existing transactional adoption journal serializes them, one caller refuses after the completed transition, and exactly one queue row remains"
+    - id: SCN-integration-adoption-legacy-retries
+      given: "An existing project database containing two historical ordinary-request retry rows with the same source branch and commit"
+      when: "IntegrationService starts"
+      then: "Both records remain readable; startup adds no global uniqueness constraint and does not reject historical evidence"
+  observable_outcomes:
+    - "Git ref values, structured refusal codes, durable journal state, and native integration-request fields"
+  determinism_controls:
+    - "Disposable local Git repositories, temporary SQLite-backed control-plane state, fixed fixture bytes, and no network or provider"
+  anti_cheat_rationale:
+    prevents:
+      - "Fixture-only CAS implementations that do not exercise Git update-ref"
+      - "Mutable lifecycle bindings or overwriteable adoption journal records"
+      - "Claiming crash recovery without preserving actual ref effects"
+      - "Treating a private candidate as an ordinary specialist branch"
+      - "Using an unrelated, source-only, stale, or mismatched approval as adoption authority"
+      - "Duplicating a private-ref queue record through concurrent authenticated API requests or replay"
+      - "Rejecting historical ordinary-request retry evidence with an unqualified schema constraint"
+  relaxation:
+    did_relax_any_assertion: false
+    if_true_explain_spec_basis: ""
+```
+
+```yaml
+test_integrity_note:
+  change_type: new_tests
+  scenarios:
+    - id: SCN-integration-adoption-lifecycle-revision-cas
+      given: "A prepared or finalized owner-bound adoption record with a known journal revision"
+      when: "A caller supplies a stale or omitted expectedRecordRevision to finalize, reconcile, rollback, or request native qualification"
+      then: "The operation refuses before private-ref, journal, queue, or audit effects; the original record and refs remain unchanged"
+  observable_outcomes:
+    - "ADOPTION_RECORD_REVISION_STALE is returned for stale or omitted lifecycle callers"
+    - "Private candidate/archive refs, durable journal record, audit count, and integration queue remain unchanged for every rejected lifecycle call"
+  determinism_controls:
+    - "Disposable local Git repository and temporary SQLite-backed control-plane fixture; no network, provider, or live adoption"
+  anti_cheat_rationale:
+    prevents:
+      - "Issuing external ref or queue effects from a stale lifecycle read"
+      - "Treating journal revision as an internal-only implementation detail"
+  relaxation:
+    did_relax_any_assertion: false
+    if_true_explain_spec_basis: ""
+```
+
+```yaml
+test_integrity_note:
+  change_type: spec_correction
+  scenarios:
+    - id: SCN-integration-adoption-request-replay
+      given: "Two authenticated callers carry the same finalized adoption revision into the serialized native-request transition"
+      when: "One caller completes the transition and the other resumes with its now-stale expectedRecordRevision"
+      then: "The second caller strictly receives ADOPTION_RECORD_REVISION_STALE while exactly one requested journal record and one queue row remain"
+  observable_outcomes:
+    - "The replay loser reports the stale journal-revision boundary, not a generic post-state refusal"
+    - "Exactly one private-ref integration request and requested audit transition exist"
+  spec_correction_basis:
+    - "The former ADOPTION_REQUEST_STATE_INVALID replay expectation was wrong: after the serialized winner commits, the loser carries an obsolete journal revision, so revision CAS is the first observable refusal boundary under SCN-integration-adoption-request-replay."
+  determinism_controls:
+    - "Two independently opened local API processes over disposable Git and SQLite fixture state"
+  anti_cheat_rationale:
+    prevents:
+      - "Accepting a stale lifecycle read after another caller has committed"
+      - "Relaxing the exactly-one-request invariant after adding revision binding"
+  relaxation:
+    did_relax_any_assertion: false
+    if_true_explain_spec_basis: ""
+```
+
 ## 2026-10-03 — Schema-v2 read-only owner-reply boundary
 
 ```yaml
diff --git a/src/integration/adoption.mjs b/src/integration/adoption.mjs
new file mode 100644
index 0000000..4d2c7d5
--- /dev/null
+++ b/src/integration/adoption.mjs
@@ -0,0 +1,384 @@
+import { createHash, randomUUID } from 'node:crypto';
+import { spawnSync } from 'node:child_process';
+import { resolve } from 'node:path';
+import { TorchError } from '../kernel/errors.mjs';
+import { observeRuntimeTurn } from '../runtime/turn-guard.mjs';
+
+const ADOPTION_SCHEMA = 'torch.dev/integration-adoption/v1alpha1';
+const AUTHORITY_SCHEMA = 'torch.dev/integration-adoption-authority/v1alpha1';
+const ADAPTER_NAME = 'git-private-ref-cas-v1';
+const ACTIONS = new Set(['plan', 'prepare', 'finalize', 'reconcile', 'rollback', 'request']);
+const MUTATING_ACTIONS = new Set(['prepare', 'finalize', 'rollback', 'request']);
+const SHA = /^[0-9a-f]{40,64}$/;
+const SAFE_ID = /^[a-zA-Z0-9][a-zA-Z0-9._-]{0,119}$/;
+const ZERO_SHA = '0'.repeat(40);
+
+function git(root, args, { allowFailure = false } = {}) {
+  const result = spawnSync('git', ['-C', root, ...args], { encoding: 'utf8' });
+  if (result.status !== 0 && !allowFailure) {
+    throw new TorchError(`Git command failed: git ${args.join(' ')}`, {
+      code: 'GIT_COMMAND_FAILED', details: result.stderr?.trim() || null,
+    });
+  }
+  return { status: result.status, stdout: result.stdout?.trim() ?? '', stderr: result.stderr?.trim() ?? '' };
+}
+
+function tableExists(database, name) {
+  return Boolean(database.prepare("SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = ?").get(name));
+}
+
+function text(value, name) {
+  if (typeof value !== 'string' || !value.trim()) {
+    throw new TorchError(`${name} is required`, { code: 'ADOPTION_INPUT_INVALID', details: { name } });
+  }
+  return value.trim();
+}
+
+function sha(value, name) {
+  const normalized = text(value, name);
+  if (!SHA.test(normalized)) throw new TorchError(`${name} must be a full Git object id`, {
+    code: 'ADOPTION_INPUT_INVALID', details: { name },
+  });
+  return normalized;
+}
+
+function digest(value) {
+  return createHash('sha256').update(JSON.stringify(value)).digest('hex');
+}
+
+function durableRecord(event) {
+  if (!event?.details) return null;
+  try {
+    const record = JSON.parse(event.details);
+    return record?.schema === ADOPTION_SCHEMA ? record : null;
+  } catch { return null; }
+}
+
+function listWorktreePaths(root) {
+  const records = [];
+  for (const line of git(root, ['worktree', 'list', '--porcelain']).stdout.split('\n')) {
+    if (line.startsWith('worktree ')) records.push(line.slice('worktree '.length));
+  }
+  return records;
+}
+
+function authorityFrom(approval) {
+  if (!approval || approval.status !== 'approved' || approval.approver_id !== 'owner' || approval.decided_by !== 'owner') return null;
+  try {
+    const authority = JSON.parse(approval.decision_note ?? '');
+    return authority?.schema === AUTHORITY_SCHEMA ? authority : null;
+  } catch { return null; }
+}
+
+function exactAuthority(authority, binding) {
+  if (!authority || authority.action !== binding.action) return false;
+  const fields = ['adoptionId', 'candidateSha', 'baseTargetSha', 'provenanceManifestDigest',
+    'contributorArea', 'destinationArea', 'targetBranch', 'candidateRef', 'expectedOldRef'];
+  return fields.every((field) => authority[field] === binding[field])
+    && authority.adapter?.name === binding.adapter?.name
+    && authority.adapter?.id === binding.adapter?.id;
+}
+
+function exactInput(record, input) {
+  const fields = ['adoptionId', 'candidateSha', 'baseTargetSha', 'provenanceManifestDigest',
+    'contributorArea', 'destinationArea', 'targetBranch', 'candidateRef', 'expectedOldRef'];
+  const mismatches = fields.filter((field) => input[field] !== undefined
+    && input[field] !== (field === 'adoptionId' ? record.id : record[field]));
+  if (input.provenance !== undefined && JSON.stringify(input.provenance) !== JSON.stringify(record.provenance)) mismatches.push('provenance');
+  if (mismatches.length) throw new TorchError('Lifecycle input cannot override immutable prepared adoption fields', {
+    code: 'ADOPTION_IMMUTABLE_BINDING_STALE', details: { adoptionId: record.id, fields: mismatches },
+  });
+  if (!Number.isInteger(input.expectedRecordRevision) || input.expectedRecordRevision !== record.revision) {
+    throw new TorchError('Lifecycle input must bind the current adoption record revision', {
+      code: 'ADOPTION_RECORD_REVISION_STALE',
+      details: { adoptionId: record.id, expectedRevision: input.expectedRecordRevision ?? null, actual: record.revision },
+    });
+  }
+}
+
+/**
+ * Real Git private-ref transaction adapter. It is source code only: callers
+ * decide when it is invoked, while the adapter itself gives temp-repository
+ * scenarios the same atomic update-ref semantics as a real repository.
+ */
+export class GitPrivateRefAdapter {
+  constructor({ repositoryRoot } = {}) {
+    this.repositoryRoot = resolve(text(repositoryRoot, 'repositoryRoot'));
+    this.name = ADAPTER_NAME;
+    this.id = digest({ adapter: this.name, repositoryRoot: this.repositoryRoot });
+  }
+
+  readRefs(refs) {
+    const values = {};
+    for (const ref of refs) {
+      const result = git(this.repositoryRoot, ['rev-parse', '--verify', '--quiet', ref], { allowFailure: true });
+      values[ref] = result.status === 0 ? result.stdout : null;
+    }
+    return values;
+  }
+
+  compareAndSwapRefs({ expected = [], writes = [] } = {}) {
+    const commands = ['start'];
+    const writtenRefs = new Set(writes.map((entry) => entry.ref));
+    for (const { ref, sha: expectedSha } of expected) {
+      if (writtenRefs.has(ref)) continue;
+      commands.push(`verify ${text(ref, 'ref')} ${expectedSha ?? ZERO_SHA}`);
+    }
+    for (const { ref, sha: nextSha } of writes) {
+      const expectedEntry = expected.find((entry) => entry.ref === ref);
+      if (!expectedEntry) throw new TorchError('Every private-ref write requires an exact expected value', {
+        code: 'ADOPTION_REF_CAS_EXPECTED_REQUIRED', details: { ref },
+      });
+      const current = expectedEntry.sha ?? null;
+      if (nextSha === null) commands.push(`delete ${text(ref, 'ref')} ${current ?? ZERO_SHA}`);
+      else commands.push(`update ${text(ref, 'ref')} ${sha(nextSha, 'next ref sha')} ${current ?? ZERO_SHA}`);
+    }
+    commands.push('prepare', 'commit', '');
+    const result = spawnSync('git', ['-C', this.repositoryRoot, 'update-ref', '--stdin'], {
+      input: commands.join('\n'), encoding: 'utf8',
+    });
+    if (result.status !== 0) throw new TorchError('Private ref compare-and-swap refused', {
+      code: 'ADOPTION_REF_CAS_FAILED', details: result.stderr?.trim() || null,
+    });
+    return { adapter: { name: this.name, id: this.id }, expected, writes };
+  }
+}
+
+export class AdoptionService {
+  constructor({ repositoryRoot, controlPlane, clock = () => new Date(), idFactory = randomUUID, policy, refAdapter } = {}) {
+    this.repositoryRoot = repositoryRoot;
+    this.controlPlane = controlPlane;
+    this.clock = clock;
+    this.idFactory = idFactory;
+    this.policy = policy ?? {};
+    this.refAdapter = refAdapter ?? new GitPrivateRefAdapter({ repositoryRoot });
+  }
+
+  plan({ action = 'plan', actorId, approvalId, approvalRevision, adoptionId,
+    candidateSha, baseTargetSha, provenance, provenanceManifestDigest, contributorArea,
+    destinationArea, targetBranch, candidateRef, expectedOldRef, adapter } = {}) {
+    const blockers = [];
+    const id = adoptionId ? text(adoptionId, 'adoptionId') : null;
+    if (id && !SAFE_ID.test(id)) blockers.push({ code: 'ADOPTION_ID_INVALID' });
+    if (!ACTIONS.has(action)) blockers.push({ code: 'ADOPTION_ACTION_INVALID' });
+    if (actorId !== 'owner') blockers.push({ code: 'OWNER_ACTOR_REQUIRED' });
+    if (!Number.isInteger(approvalRevision) || approvalRevision < 1) blockers.push({ code: 'ADOPTION_APPROVAL_REVISION_REQUIRED' });
+    const adapterBinding = adapter?.name && adapter?.id ? { name: adapter.name, id: adapter.id } : null;
+    if (MUTATING_ACTIONS.has(action) && !adapterBinding) blockers.push({ code: 'ADOPTION_ADAPTER_BINDING_REQUIRED' });
+    if (adapterBinding && (adapterBinding.name !== this.refAdapter.name || adapterBinding.id !== this.refAdapter.id)) {
+      blockers.push({ code: 'ADOPTION_ADAPTER_PROVENANCE_INVALID' });
+    }
+
+    let candidate; let base; let provenanceDigest;
+    try {
+      candidate = sha(candidateSha, 'candidateSha');
+      base = sha(baseTargetSha, 'baseTargetSha');
+      if (!Array.isArray(provenance) || !provenance.length || provenance.some((entry) => typeof entry !== 'string' || !entry)) {
+        throw new TorchError('provenance must be a non-empty ordered string list', { code: 'ADOPTION_INPUT_INVALID' });
+      }
+      provenanceDigest = digest(provenance);
+      if (sha(provenanceManifestDigest, 'provenanceManifestDigest') !== provenanceDigest) blockers.push({ code: 'ADOPTION_PROVENANCE_DIGEST_MISMATCH', expected: provenanceDigest });
+    } catch (error) {
+      blockers.push({ code: error.code ?? 'ADOPTION_INPUT_INVALID', details: error.details ?? null });
+    }
+
+    const target = targetBranch ?? this.policy.target;
+    if (typeof target !== 'string' || !target.trim()) blockers.push({ code: 'ADOPTION_TARGET_REQUIRED' });
+    const candidateReference = candidateRef ?? (id ? `refs/torch/integration-candidates/${id}` : null);
+    const expectedReference = expectedOldRef ?? (target ? `refs/heads/${target}` : null);
+    if (!candidateReference || !/^refs\/torch\/integration-candidates\/[A-Za-z0-9._-]+$/.test(candidateReference)) blockers.push({ code: 'ADOPTION_CANDIDATE_REF_INVALID' });
+    if (!expectedReference || !/^refs\/heads\/[A-Za-z0-9._/-]+$/.test(expectedReference)) blockers.push({ code: 'ADOPTION_EXPECTED_REF_INVALID' });
+
+    let contributor; let destination;
+    try { contributor = this.controlPlane.assertIdentity(text(contributorArea, 'contributorArea')); }
+    catch (error) { blockers.push({ code: 'ADOPTION_CONTRIBUTOR_INVALID', details: error.code ?? null }); }
+    try { destination = this.controlPlane.assertIdentity(text(destinationArea, 'destinationArea')); }
+    catch (error) { blockers.push({ code: 'ADOPTION_DESTINATION_INVALID', details: error.code ?? null }); }
+    if (contributor && destination && contributor === destination) blockers.push({ code: 'ADOPTION_IDENTITIES_MUST_DIFFER' });
+
+    const binding = { action, adoptionId: id, candidateSha: candidate, baseTargetSha: base, provenanceManifestDigest: provenanceDigest,
+      contributorArea: contributor, destinationArea: destination, targetBranch: target, candidateRef: candidateReference,
+      expectedOldRef: expectedReference, adapter: adapterBinding };
+    const approval = approvalId ? this.controlPlane.database.prepare(`SELECT * FROM approval_requests WHERE id = ? AND project_id = ?`)
+      .get(approvalId, this.controlPlane.projectId) : null;
+    if (!approval) blockers.push({ code: 'ADOPTION_APPROVAL_MISSING' });
+    else if (approval.revision !== approvalRevision) blockers.push({ code: 'ADOPTION_APPROVAL_REVISION_STALE', actual: approval.revision });
+    else if (!exactAuthority(authorityFrom(approval), binding)) blockers.push({ code: 'ADOPTION_APPROVAL_BINDING_INVALID' });
+
+    if (candidate && git(this.repositoryRoot, ['cat-file', '-e', `${candidate}^{commit}`], { allowFailure: true }).status !== 0) blockers.push({ code: 'ADOPTION_CANDIDATE_MISSING' });
+    if (base && git(this.repositoryRoot, ['cat-file', '-e', `${base}^{commit}`], { allowFailure: true }).status !== 0) blockers.push({ code: 'ADOPTION_BASE_MISSING' });
+    if (candidate && base && git(this.repositoryRoot, ['merge-base', '--is-ancestor', base, candidate], { allowFailure: true }).status !== 0) blockers.push({ code: 'ADOPTION_CANDIDATE_NOT_DESCENDED_FROM_BASE' });
+    if (expectedReference && base) {
+      const current = this.refAdapter.readRefs([expectedReference])[expectedReference];
+      if (!current) blockers.push({ code: 'ADOPTION_EXPECTED_REF_MISSING' });
+      else if (current !== base) blockers.push({ code: 'ADOPTION_EXPECTED_REF_STALE', expected: base, actual: current });
+    }
+    const candidateExists = candidateReference && this.refAdapter.readRefs([candidateReference])[candidateReference] != null;
+    if (['plan', 'prepare', 'finalize'].includes(action) && candidateExists) blockers.push({ code: 'ADOPTION_CANDIDATE_REF_ALREADY_EXISTS' });
+    if (action === 'request' && !candidateExists) blockers.push({ code: 'ADOPTION_CANDIDATE_REF_MISSING' });
+
+    for (const worktree of listWorktreePaths(this.repositoryRoot)) {
+      const entries = git(worktree, ['status', '--porcelain=v1', '--untracked-files=all']).stdout.split('\n').filter(Boolean);
+      if (entries.length) blockers.push({ code: 'ADOPTION_WORKTREE_DIRTY', worktree, entries });
+    }
+    if (tableExists(this.controlPlane.database, 'worktree_guards')) {
+      for (const guard of this.controlPlane.database.prepare(`SELECT area_id, guard_type, reason FROM worktree_guards WHERE project_id = ? AND released_at IS NULL`).all(this.controlPlane.projectId)) blockers.push({ code: 'ADOPTION_WORKTREE_GUARD_ACTIVE', guard });
+    }
+    if (tableExists(this.controlPlane.database, 'resource_leases')) {
+      for (const lease of this.controlPlane.database.prepare(`SELECT id, resource_id, area_id FROM resource_leases WHERE released_at IS NULL`).all()) blockers.push({ code: 'ADOPTION_RESOURCE_LEASE_ACTIVE', lease });
+    }
+    if (tableExists(this.controlPlane.database, 'prepared_checks')) {
+      for (const check of this.controlPlane.database.prepare(`SELECT id, area_id, state FROM prepared_checks WHERE project_id = ? AND state IN ('prepared', 'running')`).all(this.controlPlane.projectId)) blockers.push({ code: 'ADOPTION_PREPARED_CHECK_ACTIVE', check });
+    }
+    for (const area of [contributor, destination].filter(Boolean)) {
+      const executor = observeRuntimeTurn({ stateRoot: this.controlPlane.stateRoot, repositoryRoot: this.repositoryRoot,
+        projectId: this.controlPlane.projectId, areaId: area, now: this.clock });
+      if (executor.state !== 'inactive') blockers.push({ code: 'ADOPTION_EXECUTOR_NOT_INACTIVE', areaId: area, executor });
+    }
+    return { action: `plan-adoption-${action}`, adoptionId: id, approval: approval ? { id: approval.id, revision: approval.revision, status: approval.status, approver: approval.approver_id } : null,
+      authority: binding, candidateSha: candidate ?? null, baseTargetSha: base ?? null, provenanceManifestDigest: provenanceDigest ?? null,
+      contributorArea: contributor ?? null, destinationArea: destination ?? null, targetBranch: target ?? null, candidateRef: candidateReference,
+      expectedOldRef: expectedReference, blockers, canProceed: blockers.length === 0, mutationPerformed: false };
+  }
+
+  #append(adoptionId, expectedRevision, record, operation) {
+    this.controlPlane.database.exec('BEGIN IMMEDIATE');
+    try {
+      this.#appendInTransaction(adoptionId, expectedRevision, record, operation);
+      this.controlPlane.database.exec('COMMIT');
+    } catch (error) { this.controlPlane.database.exec('ROLLBACK'); throw error; }
+  }
+
+  #appendInTransaction(adoptionId, expectedRevision, record, operation) {
+    const current = this.#find(adoptionId);
+    if (expectedRevision === null ? current : !current || current.revision !== expectedRevision) {
+      throw new TorchError('Adoption journal changed before this transition could be recorded', {
+        code: 'ADOPTION_RECORD_REVISION_STALE', details: { adoptionId, expectedRevision, actual: current?.revision ?? null },
+      });
+    }
+    this.controlPlane.database.prepare(`INSERT INTO audit_events
+      (id, project_id, actor_id, operation, entity_type, entity_id, details, created_at)
+      VALUES (?, ?, 'owner', ?, 'integration-adoption', ?, ?, ?)`)
+      .run(this.idFactory(), this.controlPlane.projectId, operation, adoptionId, JSON.stringify(record), this.clock().toISOString());
+  }
+
+  #fromRecord(record, input, action) {
+    exactInput(record, input);
+    return this.plan({ action, actorId: input.actorId, approvalId: input.approvalId, approvalRevision: input.approvalRevision,
+      adoptionId: record.id, candidateSha: record.candidateSha, baseTargetSha: record.baseTargetSha, provenance: record.provenance,
+      provenanceManifestDigest: record.provenanceManifestDigest, contributorArea: record.contributorArea, destinationArea: record.destinationArea,
+      targetBranch: record.targetBranch, candidateRef: record.candidateRef, expectedOldRef: record.expectedOldRef, adapter: input.adapter });
+  }
+
+  prepare(input = {}) {
+    const adoptionId = input.adoptionId ?? this.idFactory();
+    const plan = this.plan({ ...input, action: 'prepare', adoptionId });
+    if (!plan.canProceed) throw new TorchError('Adoption inputs are not eligible for preparation', { code: 'ADOPTION_PREPARE_BLOCKED', details: plan.blockers });
+    const now = this.clock().toISOString();
+    const record = { schema: ADOPTION_SCHEMA, id: adoptionId, revision: 1, state: 'prepared', approvalId: text(input.approvalId, 'approvalId'),
+      approvalRevision: input.approvalRevision, authority: plan.authority, provenance: [...input.provenance], candidateSha: plan.candidateSha,
+      baseTargetSha: plan.baseTargetSha, provenanceManifestDigest: plan.provenanceManifestDigest, candidateRef: plan.candidateRef,
+      expectedOldRef: plan.expectedOldRef, contributorArea: plan.contributorArea, destinationArea: plan.destinationArea, targetBranch: plan.targetBranch,
+      archiveRef: `refs/torch/integration-archives/${adoptionId}`, preparedAt: now, finalizedAt: null, rolledBackAt: null };
+    this.#append(adoptionId, null, record, 'integration.adoption.prepare');
+    return { ...record, mutationPerformed: true };
+  }
+
+  finalize(input = {}) {
+    const record = this.getPrepared(text(input.adoptionId, 'adoptionId'));
+    if (record.state !== 'prepared') throw new TorchError('Only a prepared adoption can be finalized', { code: 'ADOPTION_FINALIZE_STATE_INVALID', details: { state: record.state } });
+    const plan = this.#fromRecord(record, input, 'finalize');
+    if (!plan.canProceed) throw new TorchError('Adoption finalize is blocked', { code: 'ADOPTION_FINALIZE_BLOCKED', details: plan.blockers });
+    const receipt = this.refAdapter.compareAndSwapRefs({ expected: [{ ref: record.expectedOldRef, sha: record.baseTargetSha }, { ref: record.candidateRef, sha: null }, { ref: record.archiveRef, sha: null }],
+      writes: [{ ref: record.archiveRef, sha: record.baseTargetSha }, { ref: record.candidateRef, sha: record.candidateSha }] });
+    const finalized = { ...record, revision: record.revision + 1, state: 'finalized', finalizeApprovalId: text(input.approvalId, 'approvalId'),
+      finalizeApprovalRevision: input.approvalRevision, finalizedAt: this.clock().toISOString(), refReceiptDigest: digest(receipt) };
+    this.#append(record.id, record.revision, finalized, 'integration.adoption.finalize');
+    return { ...finalized, mutationPerformed: true };
+  }
+
+  reconcile(input = {}) {
+    const record = this.getPrepared(text(input.adoptionId, 'adoptionId'));
+    const plan = this.#fromRecord(record, input, 'reconcile');
+    if (!plan.canProceed) return { record, plan, state: 'blocked', mutationPerformed: false };
+    const refs = this.refAdapter.readRefs([record.expectedOldRef, record.candidateRef, record.archiveRef]);
+    const finalizedRefs = refs[record.expectedOldRef] === record.baseTargetSha && refs[record.candidateRef] === record.candidateSha && refs[record.archiveRef] === record.baseTargetSha;
+    if (record.state === 'prepared' && finalizedRefs) {
+      const recovered = { ...record, revision: record.revision + 1, state: 'finalized', finalizedAt: this.clock().toISOString(),
+        recoveredAt: this.clock().toISOString(), recovery: 'private-ref-cas-completed-before-journal' };
+      this.#append(record.id, record.revision, recovered, 'integration.adoption.reconcile-finalized');
+      return { record: recovered, refs, state: 'recovered-finalized', mutationPerformed: true };
+    }
+    if (record.state === 'finalized' && finalizedRefs) return { record, refs, state: 'consistent', mutationPerformed: false };
+    if (record.state === 'prepared' && refs[record.candidateRef] === null && refs[record.archiveRef] === null) return { record, refs, state: 'prepared', mutationPerformed: false };
+    return { record, refs, state: 'diverged', mutationPerformed: false };
+  }
+
+  rollback(input = {}) {
+    const record = this.getPrepared(text(input.adoptionId, 'adoptionId'));
+    if (record.state !== 'finalized') throw new TorchError('Only a finalized adoption can be rolled back', { code: 'ADOPTION_ROLLBACK_STATE_INVALID', details: { state: record.state } });
+    const plan = this.#fromRecord(record, input, 'rollback');
+    if (!plan.canProceed) throw new TorchError('Adoption rollback is blocked', { code: 'ADOPTION_ROLLBACK_BLOCKED', details: plan.blockers });
+    const refs = this.refAdapter.readRefs([record.expectedOldRef, record.candidateRef, record.archiveRef]);
+    const recovered = refs[record.expectedOldRef] === record.baseTargetSha
+      && refs[record.candidateRef] === null && refs[record.archiveRef] === record.baseTargetSha;
+    if (!recovered && refs[record.candidateRef] !== record.candidateSha) {
+      throw new TorchError('Candidate ref changed before rollback', { code: 'ADOPTION_ROLLBACK_REF_DIVERGED', details: refs });
+    }
+    const receipt = recovered ? { adapter: { name: this.refAdapter.name, id: this.refAdapter.id }, recovered: true, refs }
+      : this.refAdapter.compareAndSwapRefs({ expected: [{ ref: record.candidateRef, sha: record.candidateSha }], writes: [{ ref: record.candidateRef, sha: null }] });
+    const rolledBack = { ...record, revision: record.revision + 1, state: 'rolled-back', rollbackApprovalId: text(input.approvalId, 'approvalId'),
+      rollbackApprovalRevision: input.approvalRevision, rolledBackAt: this.clock().toISOString(), rollbackReceiptDigest: digest(receipt),
+      ...(recovered ? { recoveredAt: this.clock().toISOString(), recovery: 'private-ref-rollback-completed-before-journal' } : {}) };
+    this.#append(record.id, record.revision, rolledBack, 'integration.adoption.rollback');
+    return { ...rolledBack, mutationPerformed: true };
+  }
+
+  requestAdoptedCandidate(input = {}, { requestIntegration, findIntegrationRequest } = {}) {
+    if (typeof requestIntegration !== 'function') throw new TorchError('Native integration request adapter is unavailable', { code: 'ADOPTION_NATIVE_REQUEST_UNAVAILABLE' });
+    const adoptionId = text(input.adoptionId, 'adoptionId');
+    this.controlPlane.database.exec('BEGIN IMMEDIATE');
+    try {
+      const record = this.getPrepared(adoptionId);
+      exactInput(record, input);
+      if (!['finalized', 'requesting'].includes(record.state)) {
+        throw new TorchError('Only a finalized adoption can request native qualification', {
+          code: 'ADOPTION_REQUEST_STATE_INVALID', details: { state: record.state },
+        });
+      }
+      const plan = this.#fromRecord(record, input, 'request');
+      if (!plan.canProceed) throw new TorchError('Adopted candidate request is blocked', { code: 'ADOPTION_REQUEST_BLOCKED', details: plan.blockers });
+      const requesting = record.state === 'requesting' ? record : { ...record, revision: record.revision + 1, state: 'requesting',
+        requestApprovalId: text(input.approvalId, 'approvalId'), requestApprovalRevision: input.approvalRevision, requestStartedAt: this.clock().toISOString() };
+      if (record.state !== 'requesting') this.#appendInTransaction(record.id, record.revision, requesting, 'integration.adoption.request-started');
+      const existing = findIntegrationRequest?.({ candidateRef: requesting.candidateRef, commit: requesting.candidateSha });
+      if (existing && (existing.sourceArea !== requesting.contributorArea || existing.targetBranch !== requesting.targetBranch)) {
+        throw new TorchError('Existing private-ref integration request does not match this adoption', {
+          code: 'ADOPTION_INTEGRATION_REQUEST_CONFLICT', details: { adoptionId: requesting.id, integrationRequestId: existing.id },
+        });
+      }
+      const request = existing ?? requestIntegration({ adoptionId: requesting.id, areaId: requesting.contributorArea,
+        commit: requesting.candidateSha, candidateRef: requesting.candidateRef });
+      const requested = { ...requesting, revision: requesting.revision + 1, state: 'requested', integrationRequestId: request.id, requestedAt: this.clock().toISOString() };
+      this.#appendInTransaction(requesting.id, requesting.revision, requested, 'integration.adoption.request');
+      this.controlPlane.database.exec('COMMIT');
+      return { ...requested, integrationRequest: request, mutationPerformed: true };
+    } catch (error) {
+      this.controlPlane.database.exec('ROLLBACK');
+      throw error;
+    }
+  }
+
+  #find(adoptionId) {
+    const row = this.controlPlane.database.prepare(`SELECT details FROM audit_events WHERE project_id = ?
+      AND entity_type = 'integration-adoption' AND entity_id = ? ORDER BY rowid DESC LIMIT 1`).get(this.controlPlane.projectId, adoptionId);
+    return durableRecord(row);
+  }
+
+  getPrepared(adoptionId) {
+    const id = text(adoptionId, 'adoptionId');
+    const record = this.#find(id);
+    if (!record) throw new TorchError('Unknown adoption journal record', { code: 'ADOPTION_NOT_FOUND', details: { adoptionId: id } });
+    return record;
+  }
+}
diff --git a/src/integration/service.mjs b/src/integration/service.mjs
index c996634..e027dab 100644
--- a/src/integration/service.mjs
+++ b/src/integration/service.mjs
@@ -4,6 +4,7 @@ import { TorchError } from '../kernel/errors.mjs';
 import { readInstallManifest } from '../kernel/install.mjs';
 import { loadFleetDefinition } from '../kernel/worktrees.mjs';
 import { BacklogService } from '../backlog/service.mjs';
+import { AdoptionService } from './adoption.mjs';
 
 function git(root, args, { allowFailure = false } = {}) {
   const result = spawnSync('git', ['-C', root, ...args], { encoding: 'utf8' });
@@ -15,6 +16,21 @@ function git(root, args, { allowFailure = false } = {}) {
   return { status: result.status, stdout: result.stdout?.trim() ?? '', stderr: result.stderr?.trim() ?? '' };
 }
 
+function text(value, name) {
+  if (typeof value !== 'string' || !value.trim()) {
+    throw new TorchError(`${name} is required`, { code: 'INTEGRATION_INPUT_INVALID', details: { name } });
+  }
+  return value.trim();
+}
+
+function sha(value, name) {
+  const normalized = text(value, name);
+  if (!/^[0-9a-f]{40,64}$/.test(normalized)) {
+    throw new TorchError(`${name} must be a full Git object id`, { code: 'INTEGRATION_INPUT_INVALID', details: { name } });
+  }
+  return normalized;
+}
+
 function integrationRow(row) {
   if (!row) return null;
   return {
@@ -42,6 +58,8 @@ export class IntegrationService {
     this.worktrees = new Map((manifest.external ?? [])
       .filter((entry) => entry.type === 'worktree')
       .map((entry) => [entry.area, entry]));
+    this.adoption = new AdoptionService({ repositoryRoot, controlPlane, clock, idFactory,
+      policy: { target: this.policy.target } });
     this.controlPlane.database.exec(`
       CREATE TABLE IF NOT EXISTS integration_requests (
         id TEXT PRIMARY KEY,
@@ -84,12 +102,56 @@ export class IntegrationService {
         code: 'INTEGRATION_SOURCE_MOVED', details: { branchTip, sourceCommit },
       });
     }
+    return this.#registerRequest({ area, sourceBranch: worktree.branch, sourceCommit });
+  }
+
+  requestCandidate({ areaId, commit, candidateRef } = {}) {
+    throw new TorchError('Private candidate intake requires an authenticated finalized adoption', {
+      code: 'INTEGRATION_ADOPTED_INTAKE_INTERNAL_ONLY', details: { areaId, commit, candidateRef },
+    });
+  }
+
+  #requestFinalizedCandidate({ adoptionId, areaId, commit, candidateRef } = {}) {
+    const area = this.controlPlane.assertIdentity(areaId);
+    if (area === 'session-manager') {
+      throw new TorchError('Session Manager does not own a feature worktree by default', {
+        code: 'INTEGRATION_SOURCE_INVALID',
+      });
+    }
+    const adoption = this.adoption.getPrepared(text(adoptionId, 'adoptionId'));
+    if (adoption.state !== 'requesting' || adoption.contributorArea !== area
+      || adoption.candidateSha !== commit || adoption.candidateRef !== candidateRef) {
+      throw new TorchError('Private candidate does not match an authenticated finalized adoption', {
+        code: 'INTEGRATION_ADOPTED_BINDING_INVALID', details: { adoptionId, state: adoption.state },
+      });
+    }
+    const ref = text(candidateRef, 'candidateRef');
+    if (!/^refs\/torch\/integration-candidates\/[A-Za-z0-9._-]+$/.test(ref)) {
+      throw new TorchError('Adopted candidates must use a private integration candidate ref', {
+        code: 'INTEGRATION_ADOPTED_REF_INVALID', details: { candidateRef: ref },
+      });
+    }
+    const sourceCommit = sha(commit, 'commit');
+    const refTip = git(this.repositoryRoot, ['rev-parse', '--verify', ref], { allowFailure: true });
+    if (refTip.status !== 0 || refTip.stdout !== sourceCommit) {
+      throw new TorchError('Adopted candidate ref no longer names the exact requested commit', {
+        code: 'INTEGRATION_ADOPTED_REF_STALE', details: { candidateRef: ref, sourceCommit, actual: refTip.stdout || null },
+      });
+    }
+    const existing = this.controlPlane.database.prepare(`SELECT id FROM integration_requests
+      WHERE project_id = ? AND source_branch = ? AND source_commit = ? ORDER BY rowid LIMIT 1`)
+      .get(this.controlPlane.projectId, ref, sourceCommit);
+    if (existing) return this.get(existing.id);
+    return this.#registerRequest({ area, sourceBranch: ref, sourceCommit });
+  }
+
+  #registerRequest({ area, sourceBranch, sourceCommit }) {
     const targetBranch = this.policy.target;
     const baseTargetCommit = git(this.repositoryRoot, ['rev-parse', targetBranch]).stdout;
     const now = this.clock().toISOString();
     const record = {
       id: this.idFactory(), projectId: this.controlPlane.projectId, sourceArea: area,
-      sourceBranch: worktree.branch, sourceCommit, targetBranch, baseTargetCommit,
+      sourceBranch, sourceCommit, targetBranch, baseTargetCommit,
       state: 'testing', reason: null, requiredChecks: this.policy.required_checks ?? [],
       authorizedBy: null, authorizedAt: null, createdAt: now, updatedAt: now, landedAt: null,
     };
@@ -110,6 +172,44 @@ export class IntegrationService {
     return this.evaluate(record.id);
   }
 
+  planAdoption(input = {}) {
+    return this.adoption.plan(input);
+  }
+
+  prepareAdoption(input = {}) {
+    return this.adoption.prepare(input);
+  }
+
+  getPreparedAdoption(adoptionId) {
+    return this.adoption.getPrepared(adoptionId);
+  }
+
+  finalizeAdoption(input = {}) {
+    return this.adoption.finalize(input);
+  }
+
+  reconcileAdoption(input = {}) {
+    return this.adoption.reconcile(input);
+  }
+
+  rollbackAdoption(input = {}) {
+    return this.adoption.rollback(input);
+  }
+
+  requestAdoptedCandidate(input = {}) {
+    return this.adoption.requestAdoptedCandidate(input, {
+      requestIntegration: ({ adoptionId, areaId, commit, candidateRef }) => this.#requestFinalizedCandidate({ adoptionId, areaId, commit, candidateRef }),
+      findIntegrationRequest: ({ candidateRef, commit }) => this.findCandidateRequest({ candidateRef, commit }),
+    });
+  }
+
+  findCandidateRequest({ candidateRef, commit } = {}) {
+    const row = this.controlPlane.database.prepare(`SELECT id FROM integration_requests
+      WHERE project_id = ? AND source_branch = ? AND source_commit = ? ORDER BY rowid LIMIT 1`)
+      .get(this.controlPlane.projectId, candidateRef, commit);
+    return row ? this.get(row.id) : null;
+  }
+
   get(requestId) {
     const row = this.controlPlane.database.prepare('SELECT * FROM integration_requests WHERE id = ?').get(requestId);
     if (!row) throw new TorchError(`Unknown integration request: ${requestId}`, { code: 'INTEGRATION_NOT_FOUND' });
diff --git a/test/fleet/integration-adoption.test.mjs b/test/fleet/integration-adoption.test.mjs
new file mode 100644
index 0000000..3ec6641
--- /dev/null
+++ b/test/fleet/integration-adoption.test.mjs
@@ -0,0 +1,420 @@
+import assert from 'node:assert/strict';
+import { createHash } from 'node:crypto';
+import { execFileSync, spawn } from 'node:child_process';
+import { mkdtempSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { basename, join } from 'node:path';
+import test from 'node:test';
+import { openControlPlane } from '../../src/control-plane/service.mjs';
+import { analyzeRepository } from '../../src/kernel/analyze.mjs';
+import { proposeDomains } from '../../src/kernel/domains.mjs';
+import { inspectRepository } from '../../src/kernel/git.mjs';
+import { installProject } from '../../src/kernel/install.mjs';
+import { IntegrationService } from '../../src/integration/service.mjs';
+
+const sha = value => execFileSync('git', ['-C', value, 'rev-parse', 'HEAD'], { encoding: 'utf8' }).trim();
+const digest = value => createHash('sha256').update(JSON.stringify(value)).digest('hex');
+
+function fixture(name) {
+  const root = mkdtempSync(join(tmpdir(), `${name}-`));
+  execFileSync('git', ['init', '-b', 'main', root]);
+  execFileSync('git', ['-C', root, 'config', 'user.email', 'torch-test@example.invalid']);
+  execFileSync('git', ['-C', root, 'config', 'user.name', 'TORCH Test']);
+  writeFileSync(join(root, 'package.json'), `${JSON.stringify({ name, scripts: {} })}\n`);
+  writeFileSync(join(root, 'app.mjs'), 'export const value = 1;\n');
+  execFileSync('git', ['-C', root, 'add', '.']);
+  execFileSync('git', ['-C', root, 'commit', '-m', 'fixture base']);
+  const repository = inspectRepository(root);
+  const proposal = proposeDomains({ repository, analysis: analyzeRepository(repository) });
+  proposal.domains.push({
+    id: 'review-area', title: 'Review Area', kind: 'development',
+    scope: ['review fixtures'], not_scope: ['application source'], owned_paths: ['review/**'],
+    shared_paths: [], neighbours: [], required_checks: [], resources: [], runtime: 'claude', evidence: ['app.mjs'],
+  });
+  proposal.checks = [];
+  proposal.review = { status: 'approved', reviewedAt: '2026-10-03T00:00:00.000Z', reviewedBy: 'fixture-owner', notes: [] };
+  const env = { ...process.env, XDG_DATA_HOME: join(tmpdir(), `${basename(root)}-state`) };
+  installProject({ repository, proposal, env, projectId: name });
+  execFileSync('git', ['-C', root, 'add', '.torch']);
+  execFileSync('git', ['-C', root, 'commit', '-m', 'install fixture control plane']);
+  const base = sha(root);
+  execFileSync('git', ['-C', root, 'checkout', '-b', 'candidate']);
+  writeFileSync(join(root, 'candidate.mjs'), 'export const candidate = true;\n');
+  execFileSync('git', ['-C', root, 'add', 'candidate.mjs']);
+  execFileSync('git', ['-C', root, 'commit', '-m', 'candidate contribution']);
+  const candidate = sha(root);
+  execFileSync('git', ['-C', root, 'checkout', 'main']);
+  const control = openControlPlane({ repositoryRoot: root, env });
+  const service = new IntegrationService({ repositoryRoot: root, controlPlane: control, checkService: { exactPasses: () => false } });
+  const contributor = proposal.domains[0].id;
+  return { root, env, control, service, contributor, destination: 'review-area', base, candidate };
+}
+
+function concurrentAdoptedRequest(context, requestInput) {
+  const childSource = `
+    import { pathToFileURL } from 'node:url';
+    import { resolve } from 'node:path';
+    const { repositoryRoot, stateRoot, requestInput } = JSON.parse(process.argv[1]);
+    const sourceRoot = process.cwd();
+    const { openControlPlane } = await import(pathToFileURL(resolve(sourceRoot, 'src/control-plane/service.mjs')).href);
+    const { IntegrationService } = await import(pathToFileURL(resolve(sourceRoot, 'src/integration/service.mjs')).href);
+    const control = openControlPlane({ repositoryRoot, env: { ...process.env, XDG_DATA_HOME: stateRoot } });
+    const service = new IntegrationService({ repositoryRoot, controlPlane: control, checkService: { exactPasses: () => false } });
+    try {
+      const result = service.requestAdoptedCandidate(requestInput);
+      console.log(JSON.stringify({ outcome: 'requested', integrationRequestId: result.integrationRequest.id }));
+    } catch (error) {
+      console.log(JSON.stringify({ outcome: 'refused', code: error.code ?? null }));
+    } finally {
+      control.close();
+    }
+  `;
+  const encoded = JSON.stringify({ repositoryRoot: context.root, stateRoot: context.env.XDG_DATA_HOME, requestInput });
+  return new Promise((resolve, reject) => {
+    const child = spawn(process.execPath, ['--input-type=module', '-e', childSource, encoded], {
+      cwd: process.cwd(), env: process.env, stdio: ['ignore', 'pipe', 'pipe'],
+    });
+    let stdout = ''; let stderr = '';
+    child.stdout.on('data', chunk => { stdout += chunk; });
+    child.stderr.on('data', chunk => { stderr += chunk; });
+    child.on('error', reject);
+    child.on('close', (code) => {
+      if (code !== 0) return reject(new Error(`concurrent adopted request child failed: ${stderr}`));
+      try { resolve(JSON.parse(stdout.trim().split('\n').at(-1))); }
+      catch (error) { reject(new Error(`invalid concurrent adopted request output: ${stdout}\n${stderr}\n${error.message}`)); }
+    });
+  });
+}
+
+function authority(context, { action, adoptionId }) {
+  const provenance = ['fixture:owner-approved', `candidate:${context.candidate}`];
+  const binding = {
+    schema: 'torch.dev/integration-adoption-authority/v1alpha1', action, adoptionId,
+    candidateSha: context.candidate, baseTargetSha: context.base,
+    provenanceManifestDigest: digest(provenance), contributorArea: context.contributor,
+    destinationArea: context.destination, targetBranch: 'main',
+    candidateRef: `refs/torch/integration-candidates/${adoptionId}`,
+    expectedOldRef: 'refs/heads/main', adapter: {
+      name: context.service.adoption.refAdapter.name, id: context.service.adoption.refAdapter.id,
+    },
+  };
+  const pending = context.control.requestApproval({
+    requester: context.contributor, approver: 'owner', task: 'TASK-f40126ee',
+    title: `Fixture ${action} authority`, summary: 'Hermetic exact-source adoption scenario.',
+  });
+  const approved = context.control.decideApproval({
+    approvalId: pending.id, decidedBy: 'owner', decision: 'approved', expectedRevision: pending.revision,
+    note: JSON.stringify(binding),
+  });
+  return {
+    approvalId: approved.id, approvalRevision: approved.revision, provenance,
+    provenanceManifestDigest: binding.provenanceManifestDigest, adapter: binding.adapter,
+  };
+}
+
+function input(context, action, adoptionId, extra = {}) {
+  return {
+    actorId: 'owner', adoptionId, candidateSha: context.candidate, baseTargetSha: context.base,
+    contributorArea: context.contributor, destinationArea: context.destination,
+    targetBranch: 'main', candidateRef: `refs/torch/integration-candidates/${adoptionId}`,
+    expectedOldRef: 'refs/heads/main', ...authority(context, { action, adoptionId }), ...extra,
+  };
+}
+
+function prepare(context, adoptionId = 'fixture-adoption') {
+  const preparedInput = input(context, 'prepare', adoptionId);
+  const plan = context.service.planAdoption({ ...preparedInput, action: 'prepare' });
+  assert.deepEqual(plan.blockers, [], `preparation must begin from an exact clean fixture: ${JSON.stringify(plan.blockers)}`);
+  return context.service.prepareAdoption(preparedInput);
+}
+
+function lifecycleInput(context, action, adoptionId, extra = {}) {
+  const { approvalId, approvalRevision, adapter } = authority(context, { action, adoptionId });
+  const record = context.service.getPreparedAdoption(adoptionId);
+  return { actorId: 'owner', adoptionId, expectedRecordRevision: record.revision, approvalId, approvalRevision, adapter, ...extra };
+}
+
+function blockedCodes(error) {
+  assert.equal(error.code.endsWith('_BLOCKED'), true, `expected a blocked adoption transition, got ${error.code}`);
+  return error.details.map((blocker) => blocker.code);
+}
+
+function lifecycleBoundary(context, adoptionId) {
+  const record = context.service.getPreparedAdoption(adoptionId);
+  return {
+    record,
+    refs: context.service.adoption.refAdapter.readRefs([
+      record.expectedOldRef, record.candidateRef, record.archiveRef,
+    ]),
+    queue: context.service.list(),
+    auditCount: context.control.database.prepare(`SELECT COUNT(*) AS count FROM audit_events
+      WHERE project_id = ? AND entity_type = 'integration-adoption' AND entity_id = ?`)
+      .get(context.control.projectId, adoptionId).count,
+  };
+}
+
+function assertLifecycleBoundaryUnchanged(context, adoptionId, before) {
+  assert.deepEqual(lifecycleBoundary(context, adoptionId), before);
+}
+
+test('SCN-integration-adoption-private-ref-cas: a real temporary Git transaction atomically creates private archive and candidate refs, and stale expected refs refuse', () => {
+  const context = fixture('torch-adoption-cas');
+  const adoptionId = 'fixture-adoption';
+  prepare(context, adoptionId);
+  const finalized = context.service.finalizeAdoption(lifecycleInput(context, 'finalize', adoptionId));
+  const refs = context.service.adoption.refAdapter.readRefs([
+    'refs/heads/main', finalized.candidateRef, finalized.archiveRef,
+  ]);
+  assert.deepEqual(refs, {
+    'refs/heads/main': context.base,
+    [finalized.candidateRef]: context.candidate,
+    [finalized.archiveRef]: context.base,
+  });
+  assert.throws(() => context.service.adoption.refAdapter.compareAndSwapRefs({
+    expected: [{ ref: finalized.candidateRef, sha: context.base }],
+    writes: [{ ref: finalized.candidateRef, sha: null }],
+  }), (error) => error.code === 'ADOPTION_REF_CAS_FAILED');
+  assert.equal(context.service.adoption.getPrepared(adoptionId).state, 'finalized');
+  context.control.close();
+});
+
+test('SCN-integration-adoption-journal-and-binding: a duplicate preparation cannot overwrite the journal and lifecycle input cannot alter its immutable candidate binding', () => {
+  const context = fixture('torch-adoption-journal');
+  const adoptionId = 'fixture-adoption';
+  const prepared = prepare(context, adoptionId);
+  assert.throws(() => context.service.prepareAdoption(input(context, 'prepare', adoptionId)),
+    (error) => error.code === 'ADOPTION_RECORD_REVISION_STALE');
+  assert.throws(() => context.service.finalizeAdoption(lifecycleInput(context, 'finalize', adoptionId, { candidateSha: context.base })),
+    (error) => error.code === 'ADOPTION_IMMUTABLE_BINDING_STALE');
+  assert.throws(() => context.service.finalizeAdoption(lifecycleInput(context, 'finalize', adoptionId, {
+    expectedRecordRevision: prepared.revision + 1,
+  })), (error) => error.code === 'ADOPTION_RECORD_REVISION_STALE');
+  const refs = context.service.adoption.refAdapter.readRefs([
+    prepared.expectedOldRef, prepared.candidateRef, prepared.archiveRef,
+  ]);
+  assert.deepEqual(refs, {
+    [prepared.expectedOldRef]: context.base,
+    [prepared.candidateRef]: null,
+    [prepared.archiveRef]: null,
+  });
+  const { mutationPerformed, ...durablePrepared } = prepared;
+  assert.equal(mutationPerformed, true);
+  assert.deepEqual(context.service.adoption.getPrepared(adoptionId), durablePrepared);
+  context.control.close();
+});
+
+test('SCN-integration-adoption-lifecycle-revision-cas: stale or omitted revisions for every lifecycle action refuse before refs, journal, queue, or audit effects', () => {
+  const cases = [
+    {
+      action: 'finalize',
+      setup: (context, adoptionId) => prepare(context, adoptionId),
+      invoke: (context, input) => context.service.finalizeAdoption(input),
+    },
+    {
+      action: 'reconcile',
+      setup: (context, adoptionId) => prepare(context, adoptionId),
+      invoke: (context, input) => context.service.reconcileAdoption(input),
+    },
+    {
+      action: 'rollback',
+      setup: (context, adoptionId) => {
+        prepare(context, adoptionId);
+        return context.service.finalizeAdoption(lifecycleInput(context, 'finalize', adoptionId));
+      },
+      invoke: (context, input) => context.service.rollbackAdoption(input),
+    },
+    {
+      action: 'request',
+      setup: (context, adoptionId) => {
+        prepare(context, adoptionId);
+        return context.service.finalizeAdoption(lifecycleInput(context, 'finalize', adoptionId));
+      },
+      invoke: (context, input) => context.service.requestAdoptedCandidate(input),
+    },
+  ];
+
+  for (const { action, setup, invoke } of cases) {
+    const context = fixture(`torch-adoption-${action}-revision-boundary`);
+    const adoptionId = 'fixture-adoption';
+    setup(context, adoptionId);
+    for (const variant of ['omitted', 'stale']) {
+      const current = lifecycleInput(context, action, adoptionId);
+      const input = variant === 'omitted'
+        ? (({ expectedRecordRevision: _expectedRecordRevision, ...withoutRevision }) => withoutRevision)(current)
+        : { ...current, expectedRecordRevision: current.expectedRecordRevision + 1 };
+      const before = lifecycleBoundary(context, adoptionId);
+      assert.throws(() => invoke(context, input), (error) => error.code === 'ADOPTION_RECORD_REVISION_STALE',
+        `${action} must reject a ${variant} lifecycle revision`);
+      assertLifecycleBoundaryUnchanged(context, adoptionId, before);
+    }
+    context.control.close();
+  }
+});
+
+test('SCN-integration-adoption-finalize-recovery: a crash after real ref CAS but before the journal transition reconciles once and never duplicates refs', () => {
+  const context = fixture('torch-adoption-finalize-recovery');
+  const adoptionId = 'fixture-adoption';
+  const prepared = prepare(context, adoptionId);
+  context.service.adoption.refAdapter.compareAndSwapRefs({
+    expected: [
+      { ref: prepared.expectedOldRef, sha: prepared.baseTargetSha },
+      { ref: prepared.candidateRef, sha: null },
+      { ref: prepared.archiveRef, sha: null },
+    ],
+    writes: [
+      { ref: prepared.archiveRef, sha: prepared.baseTargetSha },
+      { ref: prepared.candidateRef, sha: prepared.candidateSha },
+    ],
+  });
+  const recovered = context.service.reconcileAdoption(lifecycleInput(context, 'reconcile', adoptionId));
+  assert.equal(recovered.state, 'recovered-finalized');
+  assert.equal(recovered.record.recovery, 'private-ref-cas-completed-before-journal');
+  const replay = context.service.reconcileAdoption(lifecycleInput(context, 'reconcile', adoptionId));
+  assert.equal(replay.state, 'consistent');
+  assert.equal(replay.mutationPerformed, false);
+  context.control.close();
+});
+
+test('SCN-integration-adoption-rollback-recovery: a journal-missing rollback completes without a second deletion, while divergent candidate bytes refuse', () => {
+  const context = fixture('torch-adoption-rollback-recovery');
+  const adoptionId = 'fixture-adoption';
+  prepare(context, adoptionId);
+  const finalized = context.service.finalizeAdoption(lifecycleInput(context, 'finalize', adoptionId));
+  assert.equal(finalized.state, 'finalized');
+  context.service.adoption.refAdapter.compareAndSwapRefs({
+    expected: [{ ref: finalized.candidateRef, sha: finalized.candidateSha }],
+    writes: [{ ref: finalized.candidateRef, sha: null }],
+  });
+  const recovered = context.service.rollbackAdoption(lifecycleInput(context, 'rollback', adoptionId));
+  assert.equal(recovered.state, 'rolled-back');
+  assert.equal(recovered.recovery, 'private-ref-rollback-completed-before-journal');
+
+  const divergent = fixture('torch-adoption-rollback-divergence');
+  const divergentId = 'fixture-adoption';
+  prepare(divergent, divergentId);
+  const divergentFinal = divergent.service.finalizeAdoption(lifecycleInput(divergent, 'finalize', divergentId));
+  divergent.service.adoption.refAdapter.compareAndSwapRefs({
+    expected: [{ ref: divergentFinal.candidateRef, sha: divergentFinal.candidateSha }],
+    writes: [{ ref: divergentFinal.candidateRef, sha: divergent.base }],
+  });
+  assert.throws(() => divergent.service.rollbackAdoption(lifecycleInput(divergent, 'rollback', divergentId)),
+    (error) => error.code === 'ADOPTION_ROLLBACK_REF_DIVERGED');
+  context.control.close();
+  divergent.control.close();
+});
+
+test('SCN-integration-adoption-private-ref-intake: finalized private refs enter the ordinary native integration queue, not a specialist branch shortcut', () => {
+  const unfinalized = fixture('torch-adoption-unfinalized-intake');
+  const unfinalizedId = 'fixture-adoption';
+  const unfinalizedRef = `refs/torch/integration-candidates/${unfinalizedId}`;
+  unfinalized.service.adoption.refAdapter.compareAndSwapRefs({
+    expected: [{ ref: unfinalizedRef, sha: null }],
+    writes: [{ ref: unfinalizedRef, sha: unfinalized.candidate }],
+  });
+  assert.throws(() => unfinalized.service.requestCandidate({
+    areaId: unfinalized.contributor, commit: unfinalized.candidate, candidateRef: unfinalizedRef,
+  }), (error) => error.code === 'INTEGRATION_ADOPTED_INTAKE_INTERNAL_ONLY');
+  assert.deepEqual(unfinalized.service.list(), []);
+  unfinalized.control.close();
+
+  const context = fixture('torch-adoption-native-intake');
+  const adoptionId = 'fixture-adoption';
+  prepare(context, adoptionId);
+  const finalized = context.service.finalizeAdoption(lifecycleInput(context, 'finalize', adoptionId));
+  assert.throws(() => context.service.requestAdoptedCandidate(lifecycleInput(context, 'request', adoptionId, {
+    expectedRecordRevision: finalized.revision + 1,
+  })), (error) => error.code === 'ADOPTION_RECORD_REVISION_STALE');
+  assert.deepEqual(context.service.list(), []);
+  const requested = context.service.requestAdoptedCandidate(lifecycleInput(context, 'request', adoptionId));
+  assert.equal(requested.state, 'requested');
+  assert.equal(requested.integrationRequest.sourceBranch, finalized.candidateRef);
+  assert.equal(requested.integrationRequest.sourceCommit, context.candidate);
+  assert.equal(requested.integrationRequest.state, 'testing');
+  assert.equal(requested.integrationRequest.targetBranch, 'main');
+  context.control.close();
+});
+
+test('SCN-integration-adoption-approval-boundaries: unrelated or source-only approval records cannot authorize an owner adoption, and actor, action, revision, and provenance mismatches each refuse', () => {
+  const unrelated = fixture('torch-adoption-unrelated-approval');
+  const unrelatedId = 'fixture-adoption';
+  const unrelatedApproval = unrelated.control.requestApproval({
+    requester: unrelated.contributor, approver: 'owner', task: 'TASK-unrelated',
+    title: 'Ordinary source branch review', summary: 'Not an integration-adoption authority.',
+  });
+  const unrelatedApproved = unrelated.control.decideApproval({
+    approvalId: unrelatedApproval.id, decidedBy: 'owner', decision: 'approved', expectedRevision: unrelatedApproval.revision,
+    note: JSON.stringify({ schema: 'torch.dev/ordinary-source-review/v1alpha1', sourceArea: unrelated.contributor }),
+  });
+  const unrelatedInput = {
+    actorId: 'owner', adoptionId: unrelatedId, candidateSha: unrelated.candidate, baseTargetSha: unrelated.base,
+    contributorArea: unrelated.contributor, destinationArea: unrelated.destination, targetBranch: 'main',
+    candidateRef: `refs/torch/integration-candidates/${unrelatedId}`, expectedOldRef: 'refs/heads/main',
+    approvalId: unrelatedApproved.id, approvalRevision: unrelatedApproved.revision,
+    provenance: ['fixture:owner-approved', `candidate:${unrelated.candidate}`],
+    provenanceManifestDigest: digest(['fixture:owner-approved', `candidate:${unrelated.candidate}`]),
+    adapter: { name: unrelated.service.adoption.refAdapter.name, id: unrelated.service.adoption.refAdapter.id },
+  };
+  assert.throws(() => unrelated.service.prepareAdoption(unrelatedInput), (error) => blockedCodes(error).includes('ADOPTION_APPROVAL_BINDING_INVALID'));
+  assert.deepEqual(unrelated.service.list(), []);
+  unrelated.control.close();
+
+  const wrongActor = fixture('torch-adoption-wrong-actor');
+  assert.throws(() => wrongActor.service.prepareAdoption({
+    ...input(wrongActor, 'prepare', 'fixture-adoption'), actorId: wrongActor.contributor,
+  }), (error) => blockedCodes(error).includes('OWNER_ACTOR_REQUIRED'));
+  wrongActor.control.close();
+
+  const wrongAction = fixture('torch-adoption-wrong-action');
+  prepare(wrongAction, 'fixture-adoption');
+  assert.throws(() => wrongAction.service.finalizeAdoption(lifecycleInput(wrongAction, 'rollback', 'fixture-adoption')),
+    (error) => blockedCodes(error).includes('ADOPTION_APPROVAL_BINDING_INVALID'));
+  wrongAction.control.close();
+
+  const staleRevision = fixture('torch-adoption-stale-revision');
+  prepare(staleRevision, 'fixture-adoption');
+  const staleInput = lifecycleInput(staleRevision, 'finalize', 'fixture-adoption');
+  assert.throws(() => staleRevision.service.finalizeAdoption({ ...staleInput, approvalRevision: staleInput.approvalRevision - 1 }),
+    (error) => blockedCodes(error).includes('ADOPTION_APPROVAL_REVISION_STALE'));
+  staleRevision.control.close();
+
+  const wrongProvenance = fixture('torch-adoption-wrong-provenance');
+  assert.throws(() => wrongProvenance.service.prepareAdoption({
+    ...input(wrongProvenance, 'prepare', 'fixture-adoption'), provenance: ['fixture:owner-approved', 'unapproved:alternate-provenance'],
+  }), (error) => blockedCodes(error).includes('ADOPTION_PROVENANCE_DIGEST_MISMATCH'));
+  wrongProvenance.control.close();
+});
+
+test('SCN-integration-adoption-request-replay: concurrent authenticated API callers serialize on the adoption journal and create exactly one private-ref queue request', async () => {
+  const context = fixture('torch-adoption-request-replay');
+  const adoptionId = 'fixture-adoption';
+  prepare(context, adoptionId);
+  context.service.finalizeAdoption(lifecycleInput(context, 'finalize', adoptionId));
+  const requestInput = lifecycleInput(context, 'request', adoptionId);
+  const outcomes = await Promise.all([
+    concurrentAdoptedRequest(context, requestInput),
+    concurrentAdoptedRequest(context, requestInput),
+  ]);
+  assert.deepEqual(outcomes.map((entry) => entry.outcome).sort(), ['refused', 'requested']);
+  assert.equal(outcomes.find((entry) => entry.outcome === 'refused').code, 'ADOPTION_RECORD_REVISION_STALE');
+  const requests = context.service.list();
+  assert.equal(requests.length, 1);
+  assert.equal(context.service.getPreparedAdoption(adoptionId).state, 'requested');
+  context.control.close();
+});
+
+test('SCN-integration-adoption-legacy-retries: historical ordinary-request retries remain readable when integration service starts', () => {
+  const context = fixture('torch-adoption-legacy-retries');
+  const insert = context.control.database.prepare(`INSERT INTO integration_requests (
+    id, project_id, source_area, source_branch, source_commit, target_branch,
+    base_target_commit, state, reason, required_checks, created_at, updated_at
+  ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`);
+  for (const [id, state] of [['historical-failed', 'blocked'], ['historical-retry', 'superseded']]) {
+    insert.run(id, context.control.projectId, context.contributor, 'refs/heads/candidate', context.candidate,
+      'main', context.base, state, 'historical-retry', '[]', '2026-10-03T00:00:00.000Z', '2026-10-03T00:00:00.000Z');
+  }
+  assert.doesNotThrow(() => new IntegrationService({
+    repositoryRoot: context.root, controlPlane: context.control, checkService: { exactPasses: () => false },
+  }));
+  assert.equal(context.service.list().length, 2);
+  context.control.close();
+});