[plancherb1]

Two entries in docs/agent_debugging_guide.md from the 0.5.5 release receipt and merge:

• 7.z57: a submodule checkout that moves while a receipt records dirties every shard that finishes afterwards (dirtiness and the gitlink fingerprint are sampled at session finish from the checked-out HEAD); restore the pinned commits and resume so only the dirty rows re-run.
• 7.z58: a CI waiter gates on each check's status, not its conclusion, because an in-progress check run carries an empty-string conclusion that jq's // does not replace.

Docs only; no code or receipt input changes.

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