[T621] Ignore CSS comments in selector extraction

[ai21z]

Summary

• Strip CSS block comments before static selector extraction.
• Add a regression test for the T620 live-audit false failure where styles.css in a stylesheet header comment was interpreted as missing selector .css.
• Preserve existing selector/linkage behavior; real missing selector diagnostics remain covered by the existing verifier suites.

Root Cause

StaticWebSelectorAnalyzer scanned CSS selector preludes without removing block comments. A normal header comment such as /* styles.css */ could be captured before the first { and then parsed as class selector .css, causing a false static verification failure after an otherwise valid styles.css write.

Verification

• RED: StaticWebSelectorAnalyzerTest.cssFileNameInCommentIsNotTreatedAsMissingClassSelector failed before implementation with the .css false-positive.
• GREEN: same focused test passed after stripping CSS block comments.
• ./gradlew.bat test --tests "dev.talos.runtime.verification.StaticWebSelectorAnalyzerTest" --tests "dev.talos.runtime.verification.StaticTaskVerifierTest" --no-daemon
• ./gradlew.bat test --tests "dev.talos.cli.modes.ExecutionOutcomeTest" --no-daemon
• git diff --check (CRLF warnings only)
• ./gradlew.bat validateArchitectureBoundaries --no-daemon
• ./gradlew.bat check --no-daemon