Fail closed when audio is missing or media is an LFS pointer

[jmjava]

Summary

• Leftover Text() color must be keyword argument — positional arg causes cryptic ValueError #9: omitted mp3 and Git LFS pointer files no longer skip-PASS media gates.
• timing_sync returns passed=False when audio is missing or an LFS pointer.
• An LFS pointer recording fails stream_presence, av_drift, ocr_scan, and av_sync instead of one skip-PASS lfs_pointer check.
• Helpers stay small so the PR-diff complexity gate does not rise (_check_timing_sync CCN 12 → 11). Did not bump benchmark_data/baseline.json.

Test plan

• test_omitted_audio_timing_sync_fails
• test_lfs_pointer_audio_timing_sync_fails
• test_lfs_pointer_recording_does_not_skip_pass
• test_no_audio_fails (replaces skip-PASS)
• ruff check on changed files
• CI lint / unit / benchmark / validate green

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