test(react): eliminate collaborative form-reset act warning

[seonghobae]

RCA result

This branch was created to turn a previously observed protected-main React not wrapped in act(...) warning around the collaborative native-form reset test into a deterministic regression before changing any existing helper or runtime code.

Two materially distinct RED hypotheses were tried without production changes:

1. direct reset dispatch + queued reset callback while recording console.error;
2. the same reset lifecycle plus callback assertions, collaborative unmount/Y.Doc teardown, and one additional queued-task settlement while the diagnostic spy remained active.

Both exact heads passed the repository TypeScript coverage job instead of producing the expected focused RED. The second exact-head build/test job also did not reproduce the historical warning string in the inspected log evidence. This means the proposed test-only reproduction does not establish a deterministic defect boundary under the current source generation.

Per repository TDD policy, a historical intermittent warning is not sufficient authority to change dispatchReset, wrap unrelated code in act(), or add runtime synchronization without a reproducible failing boundary. The branch is therefore closed without merge rather than retaining speculative test clutter.

If the warning recurs on a fresh protected-main or PR exact head, reopen/recreate the lane from that exact run and use the complete test name, ordering, and log evidence to establish a deterministic RED before fixing it.

[coderabbitai]

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