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* fix(#706): skip rescueSummaryArtifacts when SUMMARY is already committed rescueSummaryArtifacts now probes `git cat-file -e HEAD:<path>` before copying a SUMMARY.md into the main checkout. When the file is already committed on the worktree branch, copying it as an untracked file causes `git merge --no-ff` to abort with "untracked working tree files would be overwritten by merge" — a permanent merge_failed cleanup-wave failure. Fail-closed on timeout: if cat-file is unreliable we skip rescue (the merge will surface the collision as it did before, which is recoverable). Adds 4 new test cases in worktree-safety.test.cjs covering: - committed SUMMARY skipped, merge succeeds (#706 regression case) - committed SUMMARY skipped even when timeout (fail-closed) - uncommitted SUMMARY still rescued (existing contract preserved) - rescue failure on ENOSPC still propagates (unchanged) Closes #706 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * chore: add changeset for #706 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(#706): treat cat-file exit 128 as uncertain — skip rescue (fail-closed) The previous guard skipped rescue only when `exitCode === 0` (committed) or `timedOut`. Any other non-zero exit, including `128` (fatal git error: corrupt object store, unborn HEAD, missing repo), fell through and PROCEEDED with rescue — potentially re-creating the #706 untracked-file merge collision. Fix: rescue ONLY when `exitCode === 1` (cat-file definitively reports the object absent). All other outcomes — 0 (committed), 128 (fatal), null/SIGTERM (timeout), or any other code — are treated as "uncertain → skip rescue". Also corrects the JSDoc bullet that still referenced `git ls-files --error-unmatch` (the old mechanism); updated to `git cat-file -e HEAD:<relPath>`. Regression test added: asserts rescue is SKIPPED when cat-file returns exit 128, leaving the merge to surface the issue safely rather than silently copying an already-committed file. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * chore: link changeset to PR #709 --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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