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fix(signals): a projection's synchronous throw reaches its readers (#3956) (#3979)

A re-run of a projection that threw synchronously only woke the leaves'
readers for NotReadyError; any other error stayed with the derive, which
the leaves' readers do not subscribe to, so the screen kept the last good
value. Wake them the same way so they re-derive and meet the error.

Fixes #3956


Claude-Session: https://claude.ai/code/session_01LVm3wseHt9wRTY8LfPiHmQ

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

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