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feat(signals)!: one records channel — engine records on OBSERVE.records, attribution.history(type), HoldEvent.silent/.long (#3644)

The attribution engine's ten record types (rerun, create, effect, flush,
flight, fallback, interaction, hold, navigation, graph) are RecordTypes
entries and ride OBSERVE.records like every other record; the live node
arrives as the listener's second argument, so attribution.subscribe and
OBSERVE.subjectOf are gone. DiagnosticListener gets the same second
argument. The channel keeps copy-on-write listener arrays per type
(zero allocation per emit, snapshot rounds, per-listener error
isolation). RerunEvent construction is gated on something wanting it
(listener, fold, or log); the checks read the facts directly and run in
every posture. HoldEvent carries silent/long (isSilentHold/isLongHold
removed). history()/waterfalls()/holds()/navigations()/interactions()
collapse into attribution.history(type).

Prerelease: removals ship without aliases. PR 1 of 4 in the public-API
consolidation.

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

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