reactivando / use-pubsub-js / 28116701717

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feat(v2-M2): swap the hooks to the internal pub/sub module (zero runtime deps) (#72)

Wires usePublish/useSubscribe/index to the internal `../pubsub` module and
removes pubsub-js from runtime dependencies (kept as a devDependency for the
parity test). The package now has ZERO runtime dependencies.

- hooks import { PubSub } from '../pubsub'; internalHandler widened to receive
  the original token (string | symbol), so the `as TokenType` cast is now
  truthful and symbol subscribers get the real symbol.
- useMemo both hook return objects (R3 / 08-V3) — stable identity prevents an
  exhaustive-deps infinite-loop footgun for consumers who depend on the return.
- spec oracles repointed from pubsub-js to ../pubsub (same singleton the hooks
  use); the symbol-identity contract test is now active (no longer it.todo) and
  passes against the identity-keyed module.
- example/src/service/publish.ts now imports { PubSub } from 'use-pubsub-js'
  (08-V1) and a new ci.yml step builds the library + example so a broken example
  blocks merge.

All 105 tests pass against the internal module (behavior equivalence with the
prior pubsub-js backend), 100% coverage, lint/tsc/build/e2e green, audit clean,
publint clean, attw all-green. `Message` stays `any` here; tightened to
`unknown` in M4.

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

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