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fix(signals): a write recovers an errored writable memo without a torn read (#4110) (#4167)

* fix(signals): a write clears a writable memo's previous error

STATUS_ERROR was only cleared by a recompute or an async settle, neither of which a direct write performs, so an errored memo kept throwing the stale error to every later reader.

* fix(signals): keep a writable memo's error shown until the write commits (#4110)

Builds on #4143. The error stays the display until the write commits, so a
read between the write and its flush, or under the action holding it, still
throws instead of returning the old value. A write also clears an error a
pass staged under the same hold, so effects see the written value instead
of their error arm (the action-write case left from #4148).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018LY7F9czoRqdMEvk2QwPr1

* chore(size): raise caps for the #4110 writable-memo error fix

Accepted by the maintainer on 2026-10-20: about +50 B minified on the core
floor. Also re-records #4163's +9 B, which merged without a re-record.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018LY7F9czoRqdMEvk2QwPr1

---------

Co-authored-by: Nicholas <nickylin211@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>

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