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fix(signals): tracked latest(isPending()) probe created mid-flight sees the current flight (#3166)

A latest() shadow created lazily during an active new-question flight is
born STATUS_PENDING | STATUS_UNINITIALIZED — its eager first compute reads a
source whose new answer hasn't landed. The probe path's uninitialized
suspend-throw (meant to park a tracked reader on a genuinely-first-load
source) then fired for the shadow, throwing before collecting it into the
probe; latestRead's committed-value fallback swallowed the throw, so the
probe returned with an empty source set and cached `false`. The reader was
already linked to the shadow, so it corrected itself at the next flight —
the verdict was creation-time dependent, and loading UI mounted during a
refetch never appeared for that request.

The suspend now defers to the PARENT source's initialization state: if the
parent has a committed value, latest() has something to serve, the shadow
falls through to normal collection, and the probe lands the same verdict an
already-existing probe reports.

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

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