quest: plan a failed fixer that still hands back the gate's failure

quest/m0/queue-watcher/fixer-crash-quotes-gate.md

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+# [S] A failed fixer still hands back the gate's failure
+
+## Goal
+
+When the land fixer fails for its own reasons (a crash, a refused launch, a
+timeout, an invalid result), its handback still quotes the gate's own failure:
+the check output that dropped the PR. The PR's author sees the real cause
+without reading the host's logs. A test fails a fixer run on purpose and finds
+the gate's failing output in the handback's comment.
+
+## Plan
+
+Planned 2026-11-10 (maintainer, /quest-plan in moq-dev/moq.pro): ✅ m0, in this
+epic (rejected: m1). Every hidden failure costs a person a round trip.
+
+Found on moq-dev/moq.pro on 2026-11-10. From 00:33Z to 22:43Z the host's fixer
+launcher refused every run (kixelated/nixos, fixed by its #46), and each
+handback quoted only `quest land check: [Errno 32] Broken pipe`. The gate's own
+logs held the real causes, all fixable without a person: a type error from a
+base merge, a migration check that needs a remote, and a batchmate's oversized
+skill file. Requeueing by hand then dropped the same innocent PRs again.
+
+`land-fixer.ts` already keeps "the failure log the fixer read, which a
+handback's comment quotes", but on these runs the quoted log was the wrapper's
+41-byte error. Find where that log is chosen on each failure path in `settle`,
+and quote the check's failing output there. Name the fixer's own error
+separately, as the comment's reason.
+
+## Related
+
+- [Land through a serial merge queue with an async fixer](/quest/m0/queue-watcher/README.md) -
+  the fixer this hands back from