ensure fiber is properly cleared in FiberHandle.unsafeSet

[Andarist]

This was caught by this TS experiment I'm running: microsoft/TypeScript#59559 . I believe this to be the correct change :P

[changeset-bot]

🦋 Changeset detected

Latest commit: 43bc9c3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 31 packages

Name	Type
effect	Patch
@effect/cli	Patch
@effect/cluster-browser	Patch
@effect/cluster-node	Patch
@effect/cluster-workflow	Patch
@effect/cluster	Patch
@effect/experimental	Patch
@effect/opentelemetry	Patch
@effect/platform-browser	Patch
@effect/platform-bun	Patch
@effect/platform-node-shared	Patch
@effect/platform-node	Patch
@effect/platform	Patch
@effect/printer-ansi	Patch
@effect/printer	Patch
@effect/rpc-http	Patch
@effect/rpc	Patch
@effect/schema	Patch
@effect/sql-d1	Patch
@effect/sql-drizzle	Patch
@effect/sql-kysely	Patch
@effect/sql-mssql	Patch
@effect/sql-mysql2	Patch
@effect/sql-pg	Patch
@effect/sql-sqlite-bun	Patch
@effect/sql-sqlite-node	Patch
@effect/sql-sqlite-react-native	Patch
@effect/sql-sqlite-wasm	Patch
@effect/sql	Patch
@effect/typeclass	Patch
@effect/vitest	Patch

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[tim-smart]

Thanks :)