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fix(signals): an optimistic view reads a property its inner store removed as undefined (#3883) (#3885)

* fix(signals): an optimistic view reads a property its inner store removed as undefined (#3883)

A chained store (an optimistic store over a store) served an absent key
from the outer node's cached value instead of reading through to the inner
store, so a property reconciliation removed kept its last value. Absent
keys now take the same read-through path as present ones: the outer node
is a subscription point unless it carries a guess.

Co-authored-by: GabbeV <gabriel.valfridsson@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

* size: raise signals + createStore and compiled hydrating caps for #3883

Co-authored-by: Cursor <cursoragent@cursor.com>

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Co-authored-by: GabbeV <gabriel.valfridsson@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

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