GeezerVison

Summary

Fixes #173 (Medium; memory leaks).

Three composables created long-lived reactive primitives with no disposal path, leaking whenever created outside an active effectScope.

Fixes

• deferred() — created an internal effect (and its scheduled timer/idle callback) but returned only readonly(mirror), no disposer. Now returns ReadonlySignalHandle<T> & { dispose() }; dispose() stops the effect (its cleanup cancels any pending timer) and disposes the mirror. Scope-managed behavior when inside a scope is unchanged.
• persistedSignal() — the persistence effect auto-registered with the ambient scope, so scope.stop() silently stopped persistence while the returned signal kept living, and there was no other way to stop it. Persistence now runs in a detached scope tied to the signal's own dispose(): an ambient scope.stop() no longer affects it, and signal.dispose() stops persistence.
• effectScope(detached?) — new optional param (mirrors Vue's effectScope(true)): when true the scope isn't auto-collected by an enclosing scope. Additive, backward-compatible.

(The third sub-point in the issue — module-scope computed() retention — is a documented must-dispose contract; computed already exposes dispose(). This PR addresses the two composables that had no disposal path at all.)

Verification

• deferred: new test asserts source changes stop flowing after dispose().
• persistedSignal: new tests assert persistence survives an ambient scope.stop() and stops after signal.dispose(). Both new persist tests + the deferred test fail on the pre-fix code.
• Full suite: 2989 pass / 0 fail. tsc --noEmit + eslint clean.

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