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Stage 2: store patch channel + patch-mode list driver (dormant by default) (#3079)

* stage 2 replayed onto the absorbed monorepo — patch channel current against folded next

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

* test(web): driver/classic equivalence matrix + fix(store): slot emission raced row creation on appends

The audit's merge gate (PROPOSAL §8.1), built: every identity mode ×
operation sequence runs twice — a hand-compiled patch-mode row (driver
engaged) and the same DOM under a grouped render effect, unstamped
(driver declines, classic mapArray owns the list) — and the per-step
traces must be IDENTICAL: content, order, and retention topology
(each position: new node, or moved from position j). Traces are
normalized so creation-serial order cannot fake or mask divergence;
payload object graphs are cloned per run (stores adopt/own incoming
data — sharing records between runs contaminates the second).

25 scenarios: aligned ticks, replacement (aligned and through moves),
adds, removes, reorders, clear+refill, pure appends, mixed batches,
churn, identity swaps — deep and shallow, plus retention-sanity pins
for deep key-retention and the shallow reference-rebuild ruling.

FIRST CATCH, within the hour: shallow slot emission used the
keyAligned flag as its guard, but the flag is only falsified below the
common length — appended positions past an aligned prefix (vacuously
aligned from an empty prev) emitted slot ticks for rows the row ops
had not created yet; the slot queue applies first and indexed
undefined entries (driver crash on clear-then-refill and pure
appends). Slots now require a previous slot (i < dlen); appends are
structure-only. Matrix extended with both crashing shapes.

matrix 25 / web 641 / signals 1364 green.

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

* feat(patch-lists): projection family lists drivable — chained patch registration resolves the ultimate owner

Family-channel increment 1 (the 'benchmark-shaped' an... (continued)

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