fix(prd-7): M4 test coverage review — 28 new tests for comment operations and branch setup
- test/create-initial-comment.test.ts: 15 tests covering GitHub/Forgejo
platform branches, sticky comment matching, review comment fallback,
error handling with GITHUB_OUTPUT verification
- test/update-tracking-comment.test.ts: 11 tests covering body construction,
branch link logic (issue vs PR), comment type routing, Forgejo URLs
- test/setup-branch-forgejo.test.ts: 2 tests verifying Forgejo uses
repos.getBranch() while GitHub uses git.getRef() for source branch SHA
- test/COVERAGE-NOTES.md: documents all coverage status and accepted gaps
(tag mode orchestrator, entrypoint) with rationale
- Notable finding: CLAUDE_APP_BOT_ID discrepancy flagged for M5
Progress: 67% complete (4/6 milestones) — M5 code quality next
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
