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test: harden against silent behavior drift (semantic gap hunt) (#80)

A subagent gap-hunt over the (already 100%-covered) suite found behaviors that
no test asserts — where a refactor could change runtime behavior without failing
CI. Adds 11 regression tests; the two trickiest are mutation-verified (each
fails against a plausible wrong implementation):

Bus (src/pubsub):
- by-reference unsubscribe returns false on the second call
- a sibling unsubscribed by an earlier handler mid-dispatch still fires (proves
  the publish-time snapshot, not live-channel iteration) [mutation-verified]
- subscribeOnce cleans its channel (later publish reports no subscribers)
- subscribeOnce is cancellable via its returned token before firing
- on(): manual unsubscribe removes the abort listener from the signal (no
  AbortController leak) [mutation-verified], and aborting after off() is safe
- hierarchical: a trailing-dot topic still walks ancestors (targetsFor parsing)

Hooks:
- usePublish re-routes to the new bus when the bus prop changes
- auto-publish skips null and undefined message sentinels (with 0/false/'' these
  pin all guarded cases)

debounce: immediate mode fires again on a new burst after the cooldown elapses

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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