Bugbot on PR #665: the skipScan guard emptied only the analytic
collectBrowserFindings pass, and scan()'s detached visual-contrast
stage then repopulated an ignoreFiles-waived page with contrast
markers and a second non-zero results post. Hoist the guard into
skipScanActive() and honor it in scan() and the async collector;
regenerate the browser bundle.
Adds a browser-backed regression test that reproduces the leak
(second results post carrying low-contrast findings) and pins the
zero contract; drops a tautological assert flagged in review.
AI-assisted change: implemented with Claude Code under maintainer
direction.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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