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ci: run the web suites with <Show> lowered on both compilers (#4731)

* test(web): pin the probe-gated mount tear without Show's hop

A mount gated directly by a memo that reads isPending/latest tears
(F-1, D-27): e1-3289-1831's minimized scenario paints the grouped leaf
without its attributes. Show is unaffected because its sync truthiness
memo sits between the condition and the branch. Adds a 'gate' variant to
the async-gen runner (compiler ternary, one-memo Show) and pins both as
it.fails. Blocks a cheaper Show and Show-to-ternary lowering.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWLHLSvM64QoMyA6fQJ

* fix(signals): a zombie does not retry an errored source; the S-46 mount stamp passes through a boundary (S-58)

Two shapes where a hand-written gate disagreed with `<Show>` on next, found
while making `<Show>` one memo per condition (#4708 follow-up):

- #4405's one-hop shape livelocked. The remounted gate's old content is a
  zombie until the hold lands. Its tracked re-read of the errored memo on a
  later cycle retried it (PJ-R35), the fresh error re-derived the live
  gate's verdict reader of the same memo, and that reader's retry next round
  re-derived the zombie. `read()` no longer retries an errored zombie: its
  fate is the seam's (L2).
- S-46's stamp reached only the probing pass's direct children. A boundary
  inside the mount (`<Errored>` around the content) made the content's
  effect a plain leaf, which attached with its hole empty (F-2). A first
  pass created by a stamped mount's first pass is stamped too.

S-58 gains both as cases (the Errored case fails without the fix), and
tests/zombie-errored-retry-4405.test.ts pins the livelock in all three hop
counts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWLHLSvM64QoMyA6fQJ

* chore(size): re-record the lane-engine caps for the zombie-retry and S-46 stamp f... (continued)

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