fix(mag): briefing queues /compact after feedback-digest (task-304a02a6)

[lukstafi]

Summary

• Swap order in magBriefing() (src/mag.ts) so the on-disk queue becomes briefing → feedback-digest → /compact. /compact had been wiping the briefing's in-flight context before feedback-digest could read it; now /compact lands last so digest sees the prior context and the next session starts fresh.
• Rewrite the comment block above the /compact enqueue: drops the now-false "directly behind" / "before any later automated enqueues" rationale, names the actual reason ("LAST follow-up so the next session starts fresh"), and keeps the task-a00fc0d9 / auto-compact-after-checkpoints.md reference (auto-compact contract is unchanged).
• Rename the regression test in src/mag-auto-compact.test.ts to assert the new invariant (/compact is the final queue item, feedback-digest sits between briefing and /compact when ungated). Add a sibling negative-control test that pre-seeds a pending feedback-digest to exercise the gated branch and confirm /compact still lands last (queue length 2).
• Round 2 (Codex review): Wrap the tryQueueFeedbackDigest("ludics") call in try/catch so a queue-lock timeout or state-file write failure in the digest path cannot suppress the unconditional /compact enqueue (the auto-compact-after-checkpoints contract requires /compact after every briefing). Add a regression test that spies on queueRequest to throw on the feedback-digest action and asserts /compact still lands; mutation-verified by removing the try/catch.
• magHealthCheck's /compact enqueue (src/mag.ts:3485) is untouched — it has no co-queued digest, so the ordering bug doesn't apply there.

Proposal: docs/proposals/task-304a02a6-reorder-briefing-auto-queue.md

Test plan

• bun run typecheck
• bun run lint
• bun run build
• bun test src/mag-auto-compact.test.ts — 8/8 pass (covers ungated 3-item ordering, gated 2-item ordering, digest-throws-still-enqueues-/compact, and the unchanged health-check path)

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[chatgpt-codex-connector]

Guard /compact enqueue from feedback-digest failures

magBriefing now calls tryQueueFeedbackDigest("ludics") before queuing /compact, but that helper can throw (for example, queue lock timeout in queueRequest or state-file write failures in markFeedbackDigestQueued). In those cases the function exits before enqueuing /compact, which breaks the stated “always compact after briefing” contract and can leave the next session with stale context. The /compact enqueue should be made failure-safe (e.g., via try/finally) so digest errors do not suppress compaction.

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[lukstafi]

note: branch state has drifted since this body was written (baseline: 1 commit at 2026-05-04T05:23:01Z, current: 2 commits). consider gh pr edit https://github.com/lukstafi/ludics/pull/494 to refresh.