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frames: refetched content lands at the transition's commit (#3759)

* frames: refetched content lands at the transition's commit (#3759, ported onto L2)

A refetch or single-flight region for a call a boundary is showing is
staged in the transport and the call resolves to a content token; the
mount lands it in the two halves of the render effect that follows its
address accessor. Under the hold model the two halves ride core's seams
unchanged: the compute half is the delivering transaction's pass (its
`preview` writes — the staged slot args — are held with it and commit in
the frame whose landing dissolves the lane's guesses), the effect half is
its `land` (the commit replays the staged chunks). Both signals pins
(`compute-write-joins-transition`, `settle-folds-queued-writes`) and the
optimistic-hold specs were green on untouched L2; the morph-in-transition
specs were red (3/3) and are closed by the staging.

Composes with e133516c8 (the switch gate re-arms in the pass): the rebind
— display — moves to the effect half so a switch's content waits for the
commit too (`frames-morph-in-transition` switch case), while the gate
settles on the new address's first write through a frameless waiter
registered on the host, so a second switch mid-flight still binds
(`call-driven-lifecycle`). No core seam touched. Size caps not raised:
frames 12,997 -> 13,770 B (cap 13.00 KB), page base 44,017 -> 44,765,
page live 47,656 -> 48,447 — reported for the maintainer's exception.

Signals 4898/0/2, web 1138/0 + server 1411/2 skipped + hydrate 275/0.

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

* size: Size-Exceptions for #3759 on L2 — frames 13.00 -> 13.78 KB, page base 44.05 -> 44.78, page live 47.67 -> 48.45

Refetched content lands at the transition's commit (the staging, the
content token, the two halves of the mount's follow effect, the staged
data tables, and on L2 the switch's rebind in the effect half with the
f... (continued)

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