Change the default viewport from 800x600 to 1920x1080 to render desktop
layouts by default, matching common screen resolutions. Add --width and
--height CLI flags to app_browser for both windowed and --render modes,
allowing custom viewport dimensions.
Update the investigate skill to support optional dimension arguments and
record the viewport size in investigation reports. Close CNN F-007 as
expected behavior (nav hidden by responsive CSS at narrow viewports).
Add selector engine tests for compound class selectors inside :not()
and a golden test for display:contents with :not() selectors, confirming
correct handling of CNN-style CSS patterns.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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