feat: migrate from bd (Go/Dolt) to br (beads_rust/SQLite)

[Gabko14]

Summary

• Replaces the Dolt-backed bd issue tracker with the SQLite-backed br (beads_rust v0.1.20)
• All 64 issues migrated (3 open, 60 closed, 3 with dependencies preserved)
• Removes 5 bd git hooks that fired on every commit/checkout
• Updates AGENTS.md and CLAUDE.md to use br commands
• Updates .gitignore for br's SQLite artifacts

Test plan

• br ready shows 3 open issues
• br show ghostly-hjk shows dependency on ghostly-63b
• No bd hooks in .git/hooks/
• .beads/beads.db is gitignored

[claude]

Review: feat: migrate from bd (Go/Dolt) to br (beads_rust/SQLite)

Overall: This is a clean migration from the Dolt-based bd issue tracker to the SQLite-based br (beads_rust v0.1.20). The changes are well-scoped and appropriately update all relevant documentation.

What's Good

1. Simplification - Removes complex Dolt infrastructure (hooks, sync state, multi-repo config) in favor of simpler SQLite storage
2. Documentation updates - Both AGENTS.md and CLAUDE.md are thoroughly updated with br commands
3. CLAUDE.md improvements - The added PR workflow guidance around explicit user approval before merging is valuable
4. Clean gitignore - Root .gitignore properly excludes br SQLite artifacts while keeping JSONL as source of truth

Minor Observations

1. .beads/.gitignore uses broad patterns like *.lock. Consider being more specific (e.g., beads.lock) if br only creates specific lock files. Not a blocker since this is contained to .beads/.

2. Workflow verbosity - The new br sync --flush-only + manual git commands is more verbose than the old bd sync. This is a tradeoff for br being "non-invasive" (never running git commands itself), which is clearly documented.

No Code Changes

Per CLAUDE.md guidelines, no Swift/app code was modified, so no unit tests are required for this PR.

Test Plan Verification

The test plan items look appropriate:

• br ready shows 3 open issues
• br show ghostly-hjk shows dependency on ghostly-63b
• No bd hooks in .git/hooks/
• .beads/beads.db is gitignored

Recommendation: Approve after verifying the test plan items work correctly with the new tooling.