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signals: the hold model (L2) — core rebuilt from its rulings; −23% floor, −18% hello world, 0 regressions (#3774)

* size(signals): L2 hold model, carve, lanes/verdicts/boundaries/reveal/actions — state at §27.2

Checkpoint of the measurement branch before the §28 replay of the lane
layer. The reactive engine rebuilt on the L2 hold model (transactions as
the one hold relationship), with lanes, verdicts, boundaries, reveal and
actions as modules behind GlobalQueue hooks; stores, affects() and the
attribution engine carved out for later steps. Rulings and per-step
measurements in documentation/plans/size-reduction-carve-step1.md.

Signals 4759: 2125 passed, 2536 carved, 97 failed (66 pre-existing, 15
lane-family, the rest store/affects); web 888, solid 678. Floor 7202 br.

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

* size(signals): carve the lane layer (lanes.ts, verdict.ts) for the §28 replay

Two imports stubbed (createOptimistic's write; isPending/latest), the two
files removed; the core's lane touch points stay as dead, gated code until
S0 rewrites them. Measured: + isPending/latest 9025 → 7250 br (−1775),
page live 39519 → 37710 (−1809), floor 7202 → 7193. Suite 1612 passed
(303 pins carved, 210 in the halt cascade behind them). Numbers and method
in the plan doc §28.15.

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

* size(signals): §28 S0 — the lane layer rebuilt on the slot (lanes.ts, verdict.ts)

Three places per node, each meaning one thing: _value the committed truth,
_pendingValue a transaction's staging, _x._lane the lane's value; the lane
carries shown/held. Seat from carriage; leaves read the screen; a fresh lane
is judged from its first round; body-end corrections at the seam with one
more pure round (#3409); a dissolving lane drops its runs and retires its
flights; lane work reads unparked staging through and a park repairs the
leak. Removes CONFIG_LANE_HELD, CONFIG_... (continued)

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