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fix(signals): L2 fuzz regressions under existing rules (groups 1, 2, part of 3) (#3853)

* WIP(signals): L2 fuzz regressions under existing rules (groups 1, 2, part of 3)

Over the size budget on + isPending/latest (+142 B min); shrink follows.
Read-order cases 416 and 827 pass without touching route().

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

* signals: shrink the L2 fuzz fixes (-22 B min on + isPending/latest)

- The pending-seat check decides in laneStage's leaf branch (the propagation
  passes its source as the no-answer argument) instead of a new
  GlobalQueue hook; the decline queues the mainline pending itself, so
  propagateStatus keeps its call shape (core -4 B).
- A correction drops the runs a lane's seam parked (l._held), the fact
  the seam already records, instead of re-judging blocked(l).
- The landing keeps its laneValueOf commit (the slot-only variant had no
  effect in the suite or the fuzzer).

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

* chore(size): size exception for the L2 fuzz fixes (#3853)

Raises signals: + isPending/latest (9.49 -> 9.58 KB), app: hydrating +
every store primitive family (28.93 -> 28.97 KB) and app: CSR, observe
tier + attribution engine enabled (28.66 -> 28.70 KB) to CI brotli + 10 B
with their recorded minified, from Size run 37596666473. Accepted by the
maintainer 2026-10-07.

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

* chore(size): page: live floor exception for the L2 fuzz fixes (#3853)

48.82 -> 48.89 KB, recorded minified 158,377 B, from Size run
37599458941 after #3846 re-based the floor. Accepted by the maintainer
2026-10-07.

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

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

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