LF normalization across OSes; *.sql pinned to LF for stable diffs.
Tests cover the rational frame-rate parser (NTSC 29.97, integer fps,
slow-mo 240, ffprobe's 0/0 unknown sentinel, malformed and out-of-range
inputs). Extracted the closure into a free fn for the test seam.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
