CapabilityEventsTests.EachEventKindReachesOnlyItsOwnSubscribers publishes one
of each event kind and asserts every subscriber list holds exactly its own
event -- a subscriber to Absorb must never see a Grab/Melee/Thrust event.
Mutation entry in tests/mutation_tests.py kills a mutant that makes
PublishAbsorb also notify the Thrust stream, plus a no-op control proving the
mutation script's own read/replace/restore path is transparent for this file.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
