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chore!: bundle/packaging hygiene (drop utils/debounce subpath, es2021 target) (#88)

From the bundle/distribution audit:
- Remove the vestigial `debounce.debounce = debounce` self-assignment — a real
  module-level side effect that contradicted `sideEffects: false`.
- Drop the undocumented `./utils/debounce` public subpath export (+ typesVersions).
  debounce stays an internal implementation detail of usePublish.
- tsdown: pin an explicit `target: 'es2021'` (this is a browser library;
  previously inferred from engines.node, which read confusingly as node18).
- e2e: add a dual-package identity guard — the barrel `PubSub` and the `./pubsub`
  subpath must be the same singleton within a module system (guards the exports
  map against accidentally instantiating two buses).
- Note in source why `/*#__PURE__*/` on the singleton isn't used (minification
  strips it; `sideEffects: false` is the effective tree-shaking mechanism).

125 tests, 100% coverage, lint clean, e2e 12/12, attw + publint clean.

BREAKING CHANGE: the `use-pubsub-js/utils/debounce` subpath is no longer exported.

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

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