### Fixed

- The issue sweep no longer derives label writes from a read that failed. An
  HTTP 504 whose body is GitHub's JSON error object passed every guard and
  emptied the label set, so a healthy epic was written `needs-triage` and the
  pass reported success (#247).
- A failed comments read no longer reclaims a live claim. Swallowed, it dated
  the issue by `created_at` and unassigned the builder under a comment
  asserting 48 hours of silence about an issue commented on seconds earlier
  (#247).
- A failed comments read no longer reads as "no marker", which re-posted the
  comment the marker exists to suppress (#247).
- Every read inside the per-issue subshell is checked explicitly, on its
  status and on its payload shape; the issue is left exactly as it is and the
  sweep continues. A partial pass names its skipped issues after
  `reconciled.` (#247).
- A per-issue pass is now atomic: its writes and its log lines commit only
  once the pass completes. A skip could previously land after an earlier
  mutation, reporting an issue as untouched when a label had already been
  written or removed (#247).