Implement bd stale command (bd-c01f, closes #184)

- Add bd stale command to find abandoned/forgotten issues
- Support --days (default 30), --status, --limit, --json flags
- Implement GetStaleIssues in SQLite and Memory storage
- Add full RPC/daemon support
- Comprehensive test suite (6 tests, all passing)
- Update AGENTS.md documentation

Resolves GitHub issue #184

Amp-Thread-ID: https://ampcode.com/threads/T-f021ddb8-54e3-41bf-ba7a-071749663c1d
Co-authored-by: Amp <amp@ampcode.com>

.beads/beads.jsonl

@@ -117,6 +117,7 @@
 {"id":"bd-b6b2","content_hash":"c7a641bdb4c98b14816e2d85ec09db6def89aa4918ad59f4c1f8f71c6a42c6d4","title":"Feature with design","description":"This is a description","design":"Use MVC pattern","acceptance_criteria":"All tests pass","status":"open","priority":2,"issue_type":"feature","created_at":"2025-10-31T21:40:34.612465-07:00","updated_at":"2025-10-31T21:40:34.612465-07:00"}
 {"id":"bd-bc2c6191","content_hash":"533e56b8628e24229a4beb52f8683355f6ca699e34a73650bf092003d73c2957","title":"Audit Current Cache Usage","description":"Understand exactly what code depends on the storage cache","acceptance_criteria":"- Document showing all cache dependencies\n- Confirmation that removing cache won't break MCP\n- List of tests that need updating\n\nFiles to examine:\n- internal/rpc/server_cache_storage.go (cache implementation)\n- internal/rpc/client.go (how req.Cwd is set)\n- internal/rpc/server_*.go (all getStorageForRequest calls)\n- integrations/beads-mcp/ (MCP multi-repo logic)\n\nTasks:\n- Document all callers of getStorageForRequest()\n- Verify req.Cwd is only set by RPC client for database discovery\n- Confirm MCP server doesn't rely on multi-repo cache behavior\n- Check if any tests assume multi-repo routing\n- Review environment variables: BEADS_DAEMON_MAX_CACHE_SIZE, BEADS_DAEMON_CACHE_TTL, BEADS_DAEMON_MEMORY_THRESHOLD_MB","status":"open","priority":1,"issue_type":"task","created_at":"2025-10-27T23:02:43.506373-07:00","updated_at":"2025-10-31T20:36:49.334214-07:00"}
 {"id":"bd-bdaf24d5","content_hash":"6ccdbf2362d22fbbe854fdc666695a7488353799e1a5c49e6095b34178c9bcb4","title":"Final validation test","description":"","status":"closed","priority":2,"issue_type":"task","created_at":"2025-10-27T18:27:28.310533-07:00","updated_at":"2025-10-31T12:00:43.184995-07:00","closed_at":"2025-10-31T12:00:43.184995-07:00"}
+{"id":"bd-c01f","content_hash":"b183cc4d99f74e9314f67d927f1bd1255608632b47ce0352af97af5872275fec","title":"Implement bd stale command to find abandoned/forgotten issues","description":"Add bd stale command to surface issues that haven't been updated recently and may need attention.\n\nUse cases:\n- In-progress issues with no recent activity (may be abandoned)\n- Open issues that have been forgotten\n- Issues that might be outdated or no longer relevant\n\nQuery logic should find non-closed issues where updated_at exceeds a time threshold.\n\nShould support:\n- --days N flag (default 30-90 days)\n- --status filter (e.g., only in_progress)\n- --json output for automation\n\nReferences GitHub issue #184 where user expected this command to exist.","design":"Implementation approach:\n1. Add new command in cmd/bd/stale.go\n2. Query issues with: status != 'closed' AND updated_at \u003c (now - N days)\n3. Support filtering by status (open, in_progress, blocked)\n4. Default threshold: 30 days (configurable via --days)\n5. JSON output for agent consumption\n6. Order by updated_at ASC (oldest first)","status":"closed","priority":2,"issue_type":"epic","created_at":"2025-10-31T22:48:46.85435-07:00","updated_at":"2025-10-31T22:54:33.704492-07:00","closed_at":"2025-10-31T22:54:33.704492-07:00"}
 {"id":"bd-c825f867","content_hash":"27cecaa2dc6cdabb2ae77fd65fbf8dca8f4c536bdf140a13b25cdd16376c9845","title":"Add docs/architecture/event_driven.md","description":"Copy event_driven_daemon.md into docs/ folder. Add to documentation index.","status":"open","priority":2,"issue_type":"task","created_at":"2025-10-28T16:20:02.431399-07:00","updated_at":"2025-10-30T17:12:58.221939-07:00"}
 {"id":"bd-c947dd1b","content_hash":"79bd51b46b28bc16cfc19cd19a4dd4f57f45cd1e902b682788d355b03ec00b2a","title":"Remove Daemon Storage Cache","description":"The daemon's multi-repo storage cache is the root cause of stale data bugs. Since global daemon is deprecated, we only ever serve one repository, making the cache unnecessary complexity. This epic removes the cache entirely for simpler, more reliable direct storage access.","design":"For local daemon (single repository), eliminate the cache entirely:\n- Use s.storage field directly (opened at daemon startup)\n- Remove getStorageForRequest() routing logic\n- Remove server_cache_storage.go entirely (~300 lines)\n- Remove cache-related tests\n- Simplify Server struct\n\nBenefits:\n✅ No staleness bugs: Always using live SQLite connection\n✅ Simpler code: Remove ~300 lines of cache management\n✅ Easier debugging: Direct storage access, no cache indirection\n✅ Same performance: Cache was always 1 entry for local daemon anyway","acceptance_criteria":"- Daemon has no storage cache code\n- All tests pass\n- MCP integration works\n- No stale data bugs\n- Documentation updated\n- Performance validated","status":"closed","priority":1,"issue_type":"epic","created_at":"2025-10-28T10:50:15.126939-07:00","updated_at":"2025-10-30T17:12:58.21743-07:00","closed_at":"2025-10-28T10:49:53.612049-07:00"}
 {"id":"bd-c9a482db","content_hash":"35c1ad124187c21b4e8dae7db46ea5d00173d33234a9b815ded7dcf0ab51078e","title":"Add internal/ai package for AI-assisted repairs","description":"Add AI integration package to support AI-powered repair commands.\n\nProviders:\n- Anthropic (Claude)\n- OpenAI\n- Ollama (local)\n\nFeatures:\n- Conflict resolution analysis\n- Duplicate detection via embeddings\n- Configuration via env vars (BEADS_AI_PROVIDER, BEADS_AI_API_KEY, etc.)\n\nSee repair_commands.md lines 357-425 for design.","status":"open","priority":2,"issue_type":"task","created_at":"2025-10-28T19:37:55.722841-07:00","updated_at":"2025-10-30T17:12:58.180177-07:00"}