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Renn F
2ed7f5978f
The root loop-stopper (F016) was root-only; a weak cell PM could re-submit the unchanged cell->root PR after a pr_fail and loop awaiting_pr_review -> pr_fail forever (the cell analogue of the 2026-06-27 root loop). pr_fail stamps the assembled PR's head SHA into notes_structured.pr_review .head_sha for cell AND root gate tasks alike (the capture is gate-verb- level, not root-level), so the same structural refusal applies to submit_up: if the cell PR's current head SHA equals the SHA the last pr_fail recorded, no new dev work landed on the cell branch -> the diff is byte-identical -> refuse, do not re-open the gate. Different SHA -> branch advanced -> allow. - _submit_up_unchanged_pr_guard mirrors _submit_root_unchanged_pr_guard (cell-PM remediation: re-delegate to the dev + wait for re-assembly), wired into submit_up after _submit_up_guard passes. - Renamed shared _current_root_pr_head_sha -> _current_pr_head_sha (both guards use it; the lookup was never root-specific). - Every ambiguous case FAILS OPEN (no prior fail, no recorded sha, no pr_number, no resolvable project, git/closed-PR None) — only the exact- unchanged case is hard-blocked. TDD red->green; ruff + mypy clean; F007+F016 guard suites green (15 passed).