fix(audits): avoid caption false positives

[miguel-heygen]

Summary

• preserve lexical scopes while expanding computed GSAP loops so iteration-local DOM targets remain distinct
• stop promoting text from hidden descendant captions to a visible parent during layout occlusion audits
• add parser lint and browser-audit regression coverage for both reported false positives

Reproduction

Confirmed against HyperFrames 0.7.54 and 0.7.55:

• loop-local getElementById("caption-card-" + i) targets were collapsed to the first selector and triggered overlapping_gsap_tweens
• a visible caption container whose only text child had opacity 0 was reported as text_occluded

Verification

• parsers: 27 files passed; 812 tests passed
• lint: 13 files passed; 363 tests passed
• CLI layout/check: 2 files passed; 78 tests passed
• parser lint and CLI typechecks passed
• both original source-level repro projects now return zero findings

[miguel-heygen]

Superseded by #2413, which consolidates this regression with the related lint/audit correctness fixes, preserves the unique coverage, and is green across all required CI.