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083a6fc990
Two blocking lifecycle findings from the deep review: - `SessionStore.enter()` is a public cross-package primitive that a caller can separate from `prepare()` by arbitrary work, so it must re-check the id: a stale prepared session could otherwise overwrite a live store entry of the same id, and the stale session's detach disposer would later delete the REAL session. Re-add the duplicate-id throw (removed earlier on a coverage rationale that only held for the back-to-back internal caller). Tests cover the stale-overwrite rejection and the prepare/enter/announce lifecycle (which also covers the throw branch). - `AgentHandle.dispose()` exposed the raw single-shot cordis effect disposer, so a concurrent/second dispose() returned immediately (effect epoch already cleared) instead of awaiting the in-flight teardown — violating the dispose(): Promise<void> contract that every caller observes the same quiescence boundary. Memoize the disposal promise in startOwned. Regression test gates the loop's final flush, fires two dispose() calls, and asserts the second stays pending until the first's teardown completes (fails without the memo).