Why: agents skipped triggered reading and wrote into shared checkouts holding
other tasks' in-flight changes; the 2026-09-30 empty-list incident session
found 24 overlapping in-flight files only by accident at first write.
Evidence: positive/negative suite in a real scratch repo passed 19/19
(precheck READY/BUSY/SYNC_REQUIRED, start refuse/establish, hook main/badname/
longsubject refusals, sync checkpoint, finish recycle and abandon double-
confirm); the suite caught three real defects (pipefail empty-grep abort,
worktree gitdir COMMIT_EDITMSG resolution, message checks in the wrong hook
phase).
Impact: make setup enables pre-commit/commit-msg hooks; make precheck/task-
start/task-sync/task-finish provide the governed path; no existing workflow
removed. AGENTS.md carries the resident gate rules.
Refs: Development-Guidelines 0.1.0-draft.7; task card .task/delivery-mechanism.md
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