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fix(signals): a chained store reads through its lane values (#4762) (#4765)

* fix(signals): a chained store reads through its lane values (#4762)

A projection that returns another store as is chains to it (§7b). A lane
value left on the outer store's nodes by an earlier pass in a guess's lane
covered the inner store after the chain, so length and a stale row were
served beside the new list's rows. Chained nodes now always read through;
an optimistic target's guesses are served by its carrier first.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

* test: type the filter callback in the #4762 spec

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

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

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