fix(agents): replace gh CLI with curl for PR checking to prevent duplicate work

Agents do not have access to gh CLI, causing them to skip the pre-flight
PR check and collide on duplicate work. This replaces all gh-based PR
checking commands with curl + jq using the GitHub REST API, updates the
task claiming protocol to use branch push + started log file as the
primary lock mechanism, and updates automation scripts to use curl for
PR listing and git fetch for PR checkout.

Files updated:
- AGENTS.md (Section 12 coordination rules)
- CLAUDE.md (coordination rules)
- META_PROMPTS.md (daily + weekly meta prompts)
- daily-scheduler.md (pre-flight gate, task claiming, error handling)
- weekly-scheduler.md (pre-flight gate, task claiming, error handling)
- bitvid-pr-review-agent.md (PR enumeration + checkout)
- bitvid-ci-health-agent.md (CI run gathering)
- bitvid-weekly-synthesis-agent.md (PR metadata gathering)
- bitvid-changelog-agent.md (PR metadata verification)
- scripts/agent/review-open-prs.mjs (PR listing + checkout)
- scripts/automated-pr-review.mjs (--all mode PR listing + checkout)

https://claude.ai/code/session_01L5bzzGpZ6YTiLXcfqaL81G

docs/agents/prompts/weekly/bitvid-changelog-agent.md

@@ -128,7 +128,7 @@ PR METADATA (PR number, author) — RULES
 
 Only include PR number and author if you can **verify** them via:
   - merge commit messages that include PR numbers, OR
-  - an available local tool/config that exposes PR metadata (e.g., `gh`)
+  - the GitHub API via `curl` (e.g., `curl -s "https://api.github.com/repos/PR0M3TH3AN/bitvid/pulls?state=closed&per_page=50" | jq '[.[] | {number, title, merged_at: .merged_at}]'`)
 If not verifiable:
   - omit PR numbers/authors and keep bullets keyed to commit subjects/hashes.
 

docs/agents/prompts/weekly/bitvid-pr-review-agent.md

@@ -73,21 +73,22 @@ WORKFLOW
       - security-sensitive boundaries and logging policy
   - Confirm tooling availability:
       - `npm` available
-      - PR checkout method available (`gh` CLI or equivalent)
-    If `gh` is not available, fall back to manual instructions in the audit log.
+      - `curl` and `jq` available for GitHub API queries
+    If `curl` is not available, document that PR enumeration was not possible in the audit log.
 
 2) Enumerate open PRs
   - Preferred: `curl` command (works without gh auth):
     ```bash
     curl -s "https://api.github.com/repos/PR0M3TH3AN/bitvid/pulls?state=open&per_page=100" | jq -c '.[] | {number: .number, title: .title, created_at: .created_at, author: .user.login}'
     ```
-  - Alternative: `gh pr list` (if available/configured).
   - Otherwise: document that PR enumeration was not possible in this environment.
 
 3) For each PR: checkout and run verification
   Checkout:
-  - Preferred: `gh pr checkout <num>`
-  - Otherwise: fetch the PR branch via git remote refs (only if you can verify).
+  - Fetch the PR branch via git remote refs:
+    ```bash
+    git fetch origin pull/<num>/head:pr-<num> && git checkout pr-<num>
+    ```
 
   Install + checks (verify the script names first):
   - `npm ci` (preferred) or `npm install` if CI install is not supported

docs/agents/prompts/weekly/bitvid-weekly-synthesis-agent.md

@@ -76,11 +76,16 @@ WORKFLOW
   - Gather branch refs:
       - `git for-each-ref --sort=-committerdate --format='%(committerdate:short) %(refname:short)' refs/heads/ai`
 
-Optional method (only if tooling is available and policy allows):
-  - Use `gh` CLI or other configured tooling to fetch:
-      - PR links/status
-      - issue links/priorities
-  If not available: do not guess links; report locally-derived identifiers.
+Optional method (use curl to query the GitHub API):
+  - Fetch open PRs:
+      ```
+      curl -s "https://api.github.com/repos/PR0M3TH3AN/bitvid/pulls?state=open&per_page=100" | jq '{count: length, titles: [.[].title]}'
+      ```
+  - Fetch recently closed/merged PRs:
+      ```
+      curl -s "https://api.github.com/repos/PR0M3TH3AN/bitvid/pulls?state=closed&per_page=50&sort=updated&direction=desc" | jq '[.[] | {title: .title, merged: .merged_at, number: .number}]'
+      ```
+  If curl is unavailable: do not guess links; report locally-derived identifiers.
 
 3) Normalize items into report sections
   For each item discovered, capture: