singularity-forge/.gsd/milestones/M001/slices/S03/tasks/T01-SUMMARY.md

id	parent	milestone	provides	key_files	key_decisions	patterns_established	observability_surfaces	duration	verification_result	completed_at	blocker_discovered
T01	S03	M001	handleCreate commits dirty state before forking worktree handleMerge uses deterministic squash-merge before LLM fallback	src/resources/extensions/gsd/worktree-command.ts	Deterministic merge builds commit message as `{inferCommitType(name)}({name}) merge worktree {name}` — uses worktree name both as scope and as input to type inference Non-conflict merge errors surface directly to user and do not fall back to LLM (only conflicts trigger fallback)	Deterministic-first with LLM fallback try the fast/predictable path, catch specific failure class (conflicts), fall back to LLM only for that class	ctx.ui.notify messages distinguish deterministic merge success, conflict-triggered LLM fallback, and non-conflict errors	12m	passed	2026-03-12	false

T01: Fix worktree create ordering and add deterministic merge dispatch

Fixed handleCreate to commit before forking and handleMerge to use deterministic squash-merge with conflict-aware LLM fallback.

What Happened

1. Added imports: mergeWorktreeToMain from worktree-manager.js, inferCommitType from git-service.js, execSync from node:child_process.
2. In handleCreate(), moved autoCommitCurrentBranch() call (now line 357) before createWorktree() call (now line 361). This ensures dirty working state is committed before the new worktree forks from HEAD.
3. In handleMerge(), after the confirmation prompt and CWD switch to basePath, inserted a deterministic merge attempt using mergeWorktreeToMain(basePath, name, commitMessage). The commit message is built as {inferCommitType(name)}({name}): merge worktree {name}.
4. On success, the user is notified with file/line stats and the merge returns early (skipping LLM dispatch entirely).
5. On conflict (error message matches /conflict/i), git merge --abort cleans up the failed merge, a warning notification explains the fallback, and execution continues to the existing LLM dispatch path.
6. On non-conflict errors, the error is surfaced directly to the user and the function returns without LLM fallback.

Verification

• npm run build — passes clean
• npm run test — 114 pass, 4 fail (pre-existing, unrelated)
• grep -n confirms autoCommitCurrentBranch at line 357 precedes createWorktree at line 361 in handleCreate
• grep -n confirms mergeWorktreeToMain called at line 676 inside handleMerge
• All 6 must-haves from the task plan verified

Slice-level checks (T01 scope):

• ✅ npm run build passes
• ✅ npm run test — 114/118 pass (4 pre-existing failures)
• ✅ autoCommitCurrentBranch line < createWorktree line in handleCreate
• ✅ mergeWorktreeToMain appears in handleMerge
• ⏳ grep -c 'preserved' README.md — not yet addressed (T02 scope)
• ⏳ grep -c 'checkpoint' src/resources/GSD-WORKFLOW.md — not yet addressed (T02 scope)
• ⏳ grep -c 'Branch kept' src/resources/GSD-WORKFLOW.md — not yet addressed (T02 scope)

Diagnostics

After a /worktree merge operation, inspect the TUI notification messages:

• Deterministic success: shows "✓ Merged {name} → {mainBranch} (deterministic squash)" with commit message
• Conflict fallback: shows "Deterministic merge hit conflicts — falling back to LLM-guided merge."
• Non-conflict error: shows "Failed to merge: {error message}"

Deviations

None.

Known Issues

None.

Files Created/Modified

• src/resources/extensions/gsd/worktree-command.ts — Reordered handleCreate (autoCommit before createWorktree), added deterministic merge path in handleMerge with conflict-aware LLM fallback, added imports for mergeWorktreeToMain, inferCommitType, and execSync