Operator ruling (docs/item-provenance-cut.md Progress header, 2026-09-17):
delete EntityPack.PersistedBehaviors, IPersistentBehavior,
PersistentBehaviorData and MarkerPersistentBehaviorData outright rather than
keep patching around a feature with no production writer. Key(5) is retired
and left unused; other MessagePack keys are untouched.
Removes the pack/unpack code that read and wrote the field, the feature-only
test ReopenedPackKeepsPersistedBehaviors and its BarePack initializer, and the
matching "not yet reached" mutation notes in tests/mutation_tests.py.
ReopenSurvivesAGeneratedShipWithEntities is kept: it pins the reopen defect
class against a real generated ship, independent of this feature.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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