shard(tick): 1036Z — PR #3390 merged; primary worktree stuck >8h; mutex empirically operational

[AceHack]

Summary

Tick shard for the post-#3390-merge state:

• PR #3390 MERGED — cron-sentinel-mutex wired into docs/AUTONOMOUS-LOOP-PER-TICK.md Step 1
• Mutex empirically operational: invoked from a main-sync'd worktree reports 6 concurrent peers, exit 7
• Primary worktree stuck on Lior's rebase >8h (.git/HEAD at 65c7865 since 0230Z observation)
• Substrate-honest caveat documented: the mutex bullet only works when the Otto-CLI tick body's cwd is sync'd to main; a detached primary worktree (B-0519 Pattern 7 state) means the mutex file isn't on disk to invoke
• Peer-Otto refined the wiring docs post-merge (added exit-code clarification + strengthened the 251-code branch)

Test plan

• Markdownlint clean
• CI green
• Auto-merge fires

🤖 Generated with Claude Code

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[Copilot]

Pull request overview

Adds a new hygiene-history tick shard documenting the post-merge state after PR #3390, including mutex verification results and the ongoing “primary worktree stuck” observation so future ticks can pick up the correct operational context.

Changes:

• Add tick shard 1036Z.md with headline status, mutex behavior evidence, and next-step notes.
• Record a qualitative Δ table comparing state since the prior tick close.