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test(web): warm the traces tier in C9 so arm (b) claims at adoption (#4461)

C9 (b) reads a container-trace arg, whose materializer is the frames
client's traces tier (plan step C3, `tierLoaders.trace`, a dynamic import).
The spec never warmed it, so the marker held the occurrence
(frame-client.ts `needsTrace`) until the import landed, a module load
that two fixed `quiesce()` rounds only sometimes outlast. When it lost,
(b) saw no fill, and the orphaned held frame then mounted on the late
install's flush during (c), logging (b)'s key miss into (c)'s page.

Warm it once in `beforeAll`, as C19 and C11 do; the cold hold keeps its
own pin (tier-trace-hold.spec). Assertions unchanged.


Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

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

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