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fix(store): a lane-derived slot's presence and keys read its value's frame (#4821) (#4823)

* fix(store): a lane-derived slot's presence and keys read its value's frame (#4821)

readSource served the committed frame for any key whose leaf carries a
lane's value, so an untracked presence or keys read in a lane pass
(mapArray's slice copy) missed a slot the leaf's value read showed. When
the container carries the same lane's value, the container's frame
answers.

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

* fix(store): a leaf whose lane is gone keeps the S4 committed read (#4821)

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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