[igorls]

Reconnect could confirm stale fork records left in the LIB buffer, deliver packets addressed to the previous subscription while its replacement was registering, or resume beyond unread records after repeated outages. Invalidate old reversible state on transport and relay loss, retire stale UUID routing, and preserve an inclusive recovery boundary. LIB subscriptions holding unconfirmed data now fail with retryable STREAM_REPLAY_REQUIRED if replay is disabled.

Also fix cancellation/cache delivery after stop, removal of once listeners by their original callbacks, immediate retry after cancelling connection setup, explicit-undefined option defaults, LIB stall detection, and rejected observer promises escaping as unhandled rejections. Observer failures remain independent of packet ACKs.

Validation:

• 60 protocol tests against ESM and the same suite against CommonJS; 12 new adversarial regressions were observed failing before fixes.
• Native Node 24 core runtime coverage: 97.95% lines / 89.86% branches / 92.16% functions (previously 89.00% / 80.47% / 87.91%). Node 22 also passes the new 95/88/90 coverage floors.
• Six real Chromium ESM/UMD cases: finite history, structured setup rejection and malformed binary payloads, uint64 binary delivery and remote cancellation.
• Whole-project typecheck, packed external ESM/CommonJS and TypeScript consumers, and production dependency audit pass locally.
• CI runs the coverage gate and both Node format suites on Node 22/24 and Windows/Linux, with Chromium on Linux/Node 24.

The discovery report documents the reproductions and remaining gaps. Real Hyperion/proxy, retained-history, filtering, and long-running soak qualification remain under history-api #231. No npm publication or deployment is included.

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