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fix(signals): dev error for an untracked pending read of a memo the same body created (#4630)

* fix(signals): dev error for an untracked pending read of a memo the same body created

A component body that created an async memo and read it through a plain
untrack() under <Loading> threw NotReady to the boundary, which re-ran the
body onto a fresh pending memo forever, and the page froze (found in
TanStack Form's Solid 2 port). untrack() cleared the strict-read label, so
the dev PENDING_ASYNC_UNTRACKED_READ check that catches the same read
without untrack never fired.

A plain untrack() now keeps the body's label for that one check, limited to
a pending memo owned by the current scope. A memo created outside the body
still reaches the boundary through untrack (D-23), sync untracked reads
stay quiet, and untrack(fn, false) opts out. Dev only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

* test(web): set the JSX import source on the untrack pending-read spec

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

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

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