findCandidates/priceCandidate/judgeSweep extracted so the sync auditSweep and
the new auditSweepAsync are ONE copy of the math; scoreSite drives the async
path with onProgress ticks (sweep/fly/separation phases). Yield is a
MessageChannel task, not setTimeout — Chrome's intensive timer throttling
turned an occluded run into one flight per minute, measured. Three new
asserts, mutation-checked red-then-green in one sitting (impure chunk + a
swallowed tick = all three red with the intended diagnostics).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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