5a58e1ceaf
Track marked shipped 2026-06-17. All 6 verification criteria evaluated with PASS/EXCEEDED/READY status and notes. 7 pre-existing test failures documented with root cause and pre_existing_failures_remaining flag. Risk register updated: scope_creep=none, behavior_change=none, doc_drift=medium (error_handling.md deprecation section required surgical rewrite to historical note). No deferred_to_followup_tracks (this track completed cleanly).