docs: add phase 1 summary for fixture import harness

docs/phase1-summary.md

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+# Phase 1 Complete: Fixture Import Harness
+
+We've successfully completed the first phase of the Nostr Governance development plan, which focused on creating a fixture import harness for BitVid parity cases.
+
+## What Was Accomplished
+
+### 1. Repository Structure
+- Created fixture directories for all BitVid governance components:
+  - `admin-state/` - Administrative list states
+  - `reports/` - User reports on other users
+  - `trusted-mutes/` - Trusted mute aggregations
+  - `overrides/` - Viewer-specific overrides
+  - `expectations/` - Expected outcomes for test cases
+
+### 2. Import Infrastructure
+- Created `scripts/import-bitvid-fixtures.mjs` script for extracting behavioral cases from BitVid
+- Script is designed to work with BitVid as a read-only reference repository
+- Added proper directory setup functions and placeholder creation
+
+### 3. Characterization Framework
+- Defined `fixtures/bitvid/characterization-cases.json` with 19 key behavioral cases from BitVid
+- Created conformance test harness in `tests/conformance/bitvid-fixtures.test.js`
+- Added testing utilities in `packages/testing/src/conformance.js`
+
+### 4. Validation
+- All checks pass:
+  - `npm run check:references` - No forbidden imports
+  - `npm run typecheck` - TypeScript validation
+  - `npm test` - All tests passing (4 tests, 1 skipped)
+
+## Key Architectural Decisions
+
+1. **Reference-Only Approach**: BitVid remains a read-only reference, with behavior extracted via fixtures
+2. **Behavioral Focus**: Cases are defined by outcomes, not implementation details
+3. **Guardrails**: Import script will prevent accidental live imports from BitVid source
+4. **Extensible Framework**: Structure allows for easy addition of new characterization cases
+
+## Next Steps
+
+1. Implement actual fixture extraction from BitVid source files
+2. Begin core implementation (identifiers, targets, authority resolution)
+3. Create the pure evaluator that can process these fixtures
+4. Add first real characterization tests based on actual BitVid behavior
+
+This work provides a solid foundation for safely extracting governance behavior from BitVid without accidentally creating tight coupling between the repositories.