Add comprehensive tests for merge driver auto-config in bd init

- Test auto-install in quiet mode (bd init --quiet)
- Test --skip-merge-driver flag
- Test detection of already-installed merge driver (no duplication)
- Test append to existing .gitattributes (preserve content)
- Test non-git repo gracefully skips merge driver
- Test git config has correct merge.beads.driver settings

Fixes: bd-csvy
Amp-Thread-ID: https://ampcode.com/threads/T-b237be26-6dd8-4d4e-9b9d-b460ace8ce72
Co-authored-by: Amp <amp@ampcode.com>

.beads/beads.jsonl

@@ -181,7 +181,7 @@
 {"id":"bd-cdf7","content_hash":"50ba3c5bc3a0f06ebd20dd9b373086e0ecd218eea56a9edbef321f4e042115a4","title":"Add tests for DetectCycles to improve coverage from 29.6%","description":"DetectCycles currently has 29.6% coverage. Need comprehensive tests for:\n- Simple cycles (A-\u003eB-\u003eA)\n- Complex multi-node cycles\n- Acyclic graphs (should not detect cycles)\n- Self-loops\n- Multiple independent cycles\n- Edge cases (empty graph, single node)","status":"closed","priority":2,"issue_type":"task","created_at":"2025-11-01T22:40:58.977156-07:00","updated_at":"2025-11-01T22:52:02.243223-07:00","closed_at":"2025-11-01T22:52:02.243223-07:00","source_repo":"."}
 {"id":"bd-ce37850f","content_hash":"3ef2872c3fcb1e5acc90d33fd5a76291742cbcecfbf697b611aa5b4d8ce80078","title":"Add embedding generation for duplicate detection","description":"Use embeddings for scalable duplicate detection.\n\nModel: text-embedding-3-small (OpenAI) or all-MiniLM-L6-v2 (local)\nStorage: SQLite vector extension or in-memory\nCost: ~/bin/bash.0002 per 100 issues\n\nMuch cheaper than LLM comparisons for large databases.\n\nFiles: internal/embeddings/ (new package)","status":"open","priority":2,"issue_type":"task","created_at":"2025-10-28T14:48:29.072913-07:00","updated_at":"2025-10-30T17:12:58.219921-07:00","source_repo":"."}
 {"id":"bd-chsc","content_hash":"ea167029efad3c506e42dfc20748a6ada0914aa93cb04caa14a48ca223386365","title":"Test lowercase p0","description":"","status":"closed","priority":0,"issue_type":"task","created_at":"2025-11-05T12:58:41.457875-08:00","updated_at":"2025-11-05T12:58:44.721486-08:00","closed_at":"2025-11-05T12:58:44.721486-08:00","source_repo":"."}
-{"id":"bd-csvy","content_hash":"3451bbf916d00dae7ccca2d93e5b43b05f80654537cee27e989c68208e43a38c","title":"Add tests for merge driver auto-config in bd init","description":"Add comprehensive tests for the merge driver auto-configuration functionality in `bd init`.\n\n**Test cases needed:**\n- Auto-install in quiet mode\n- Skip with --skip-merge-driver flag\n- Detect already-installed merge driver\n- Append to existing .gitattributes\n- Interactive prompt behavior (if feasible)\n\n**File:** `cmd/bd/init_test.go`","status":"open","priority":2,"issue_type":"task","created_at":"2025-11-05T19:27:04.133078-08:00","updated_at":"2025-11-05T19:27:04.133078-08:00","source_repo":".","dependencies":[{"issue_id":"bd-csvy","depends_on_id":"bd-32nm","type":"discovered-from","created_at":"2025-11-05T19:27:04.134299-08:00","created_by":"daemon"}]}
+{"id":"bd-csvy","content_hash":"3451bbf916d00dae7ccca2d93e5b43b05f80654537cee27e989c68208e43a38c","title":"Add tests for merge driver auto-config in bd init","description":"Add comprehensive tests for the merge driver auto-configuration functionality in `bd init`.\n\n**Test cases needed:**\n- Auto-install in quiet mode\n- Skip with --skip-merge-driver flag\n- Detect already-installed merge driver\n- Append to existing .gitattributes\n- Interactive prompt behavior (if feasible)\n\n**File:** `cmd/bd/init_test.go`","status":"closed","priority":2,"issue_type":"task","created_at":"2025-11-05T19:27:04.133078-08:00","updated_at":"2025-11-06T15:56:36.014814-08:00","closed_at":"2025-11-06T15:56:36.014814-08:00","source_repo":".","dependencies":[{"issue_id":"bd-csvy","depends_on_id":"bd-32nm","type":"discovered-from","created_at":"2025-11-05T19:27:04.134299-08:00","created_by":"daemon"}]}
 {"id":"bd-d19a","content_hash":"5ff9ba5e70c3e3eeaff40887421797e30dfb75e56e97fcaaf3f3d32332f22aa2","title":"Fix import failure on missing parent issues","description":"Import process fails atomically when JSONL references deleted parent issues. Implement hybrid solution: topological sorting + parent resurrection to handle deleted parents gracefully while maintaining referential integrity. See docs/import-bug-analysis-bd-3xq.md for full analysis.","status":"closed","priority":0,"issue_type":"epic","created_at":"2025-11-04T12:31:30.994759-08:00","updated_at":"2025-11-04T17:11:40.563983-08:00","closed_at":"2025-11-04T17:11:40.563983-08:00","source_repo":"."}
 {"id":"bd-d33c","content_hash":"d0820d5dd6ea4ab198e013861d3d7d01da701daa8ab8ec59ad5ef855e6f83b2b","title":"Separate process/lock/PID concerns into process.go","description":"Create internal/daemonrunner/process.go with: acquireDaemonLock, PID file read/write, stopDaemon, isDaemonRunning, getPIDFilePath, socket path helpers, version check.","status":"closed","priority":1,"issue_type":"task","created_at":"2025-11-01T11:41:14.871122-07:00","updated_at":"2025-11-01T23:43:55.66159-07:00","closed_at":"2025-11-01T23:43:55.66159-07:00","source_repo":"."}
 {"id":"bd-d355a07d","content_hash":"b4f98403e209eadf33dd4913660c1538fd922c89339a9ed034ef504aac358662","title":"Import validation falsely reports data loss on collision resolution","description":"## Problem\n\nPost-import validation reports 'data loss detected!' when import count reduces due to legitimate collision resolution.\n\n## Example\n\n```\nImport complete: 1 created, 8 updated, 142 unchanged, 19 skipped, 1 issues remapped\nPost-import validation failed: import reduced issue count: 165 → 164 (data loss detected!)\n```\n\nThis was actually successful collision resolution (bd-70419816 duplicated → remapped to-70419816), not data loss.\n\n## Impact\n\n- False alarms waste investigation time\n- Undermines confidence in import validation\n- Confuses users/agents about sync health\n\n## Solution\n\nImprove validation to distinguish:\n- Collision-resolution merges (expected count reduction)\n- Actual data loss (unexpected disappearance)\n\nTrack remapped issue count and adjust expected post-import count accordingly.","status":"open","priority":2,"issue_type":"bug","created_at":"2025-10-29T23:15:00.815227-07:00","updated_at":"2025-10-31T19:38:09.19996-07:00","source_repo":"."}