v2.0.0

   🚨 Breaking Changes

• Drop React 17 support; require React >=18  -  by @AZagatti and Claude Opus 4.8 (1M context) in #82 (7245a)
• Route subscriber errors to a configurable onError (default console.error)  -  by @AZagatti and Claude Opus 4.8 (1M context) in #83 (b680b)
• Brand SubscriptionToken so unsubscribe rejects arbitrary strings  -  by @AZagatti and Claude Opus 4.8 (1M context) in #84 (d401d)
• Bundle/packaging hygiene (drop utils/debounce subpath, es2021 target)  -  by @AZagatti and Claude Opus 4.8 (1M context) in #88 (242a5)
• hooks: Typed bus param + Events generic; widen message; rename useSubscribe types  -  by @AZagatti and Claude Opus 4.8 (1M context) in #77 (fa60f)
• v2-M4: Semver-major type cleanups  -  by @AZagatti and Claude Opus 4.8 (1M context) in #73 (a72cc)

   🚀 Features

• Retained-value bus mode + useBusState hook (useSyncExternalStore)  -  by @AZagatti and Claude Opus 4.8 (1M context) in #86 (4079d)
• React19/useSubscribe built on useEffectEvent (opt-in subpath)  -  by @AZagatti and Claude Opus 4.8 (1M context) in #87 (85b12)
• CreateHierarchicalPubSub — typed + hierarchical bus  -  by @AZagatti and Claude Opus 4.8 (1M context) in #93 (d664a)
• v2-M1: Internal pub/sub module + isolation & parity tests (not yet wired)  -  by @AZagatti and Claude Opus 4.8 (1M context) in #71 (e2605)
• v2-M2: Swap the hooks to the internal pub/sub module (zero runtime deps)  -  by @AZagatti and Claude Opus 4.8 (1M context) in #72 (b85f1)
• v2-M5: Add ./pubsub subpath export, metadata, behavioral e2e smoke  -  by @AZagatti and Claude Opus 4.8 (1M context) in #74 (1842a)

   🏎 Performance

• pubsub: Flatten the publish snapshot to one array  -  by @AZagatti and Claude Opus 4.8 (1M context) in #89 (b4d9d)

    View changes on GitHub