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* fix(#3050): fail closed when a worktree guard cannot verify safety Three places answered "safe" when they had not actually checked. The base-divergence gate held the clearest evidence against itself: within one function, an unresolvable fork ref correctly degrades, while an unresolvable HEAD twenty-five lines earlier returned "proceed". Because a timeout collapsed into the same branch as "not a git repository", a locked index or a stalled mount produced a green gate that had never resolved the fork base -- and that value decides parallel versus sequential dispatch. Timeouts are now distinguished from a genuine absence of a repository. A timeout degrades with its own reason and message; not-a-git-repo keeps today's non-degrading behavior, because there is no worktree concern there. The same conflation in worktree-context resolution is surfaced rather than silently falling back to the current directory. Worktree creation's root confinement was opt-in: omitting the root skipped the check entirely, leaving only the leading-dash and parent-segment guards. The sole caller always passed it, so nothing was exploitable -- it is now mandatory so a future caller cannot inherit an unconfined path by forgetting. The timeout predicate was checked against what Node actually emits on a spawnSync timeout, not only against the fixtures, so it cannot be a guard that fires solely in tests. Coverage is deliberately behavioral. The existing worktree suites -- 134 tests across two files -- require no production module and call no production function; they assert against prose and would pass with the implementation deleted. That is how three fail-open guards survived in a heavily-tested module, so the new tests drive the real resolvers through an injected git seam, with five of them pinning the paths that must NOT change. One existing test asserted the opt-in confinement behavior and was rewritten rather than left green against the corrected code. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * test(#3050): stop a CLI exit code leaking into the test process The runner reported the new file as failed while the file's own summary said nine tests passed and none failed. That signature is a non-zero process exit after a green run, not a failing assertion. Cause: the confinement test calls the worktree-create command function directly, and that function sets process.exitCode on its failure path as a CLI would. In process, that exit code became the test file's own exit status. The sibling suite already guards this with a save/restore wrapper and a comment naming the hazard; the new file simply did not follow the convention. It does now. Root cause is in the test, not the production code -- setting an exit code is correct behavior for a command entry point, and the existing convention exists precisely because tests call these functions in process. Verified by exit-code and active-handle probes rather than by re-running: exit was 1, is now 0, with zero lingering handles and all nine tests still passing. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * chore(#3050): backfill changeset pr number Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
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