Add camera-raw format support (.arw/.cr2/.dng/.raw)

Verified via exiftool against real Sony ARW, Canon CR2, and Pixel DNG
files pulled from are-nas -- same EXIF DateTimeOriginal/CreateDate
tags as JPEG, no new codepath needed.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -148,7 +148,8 @@ Handles `.mov`/`.mp4`/`.m4v` (ffprobe container tags, preferring Apple's
 `creation_time`, usually UTC; falls back to exiftool's QuickTime atoms if
 neither ffprobe tag is present), `.avi` (exiftool's RIFF `DateTimeOriginal`),
 and photo formats — `.jpg`/`.jpeg`/`.png`/`.tif`/`.tiff`/`.heic`/`.heif`
-(exiftool's EXIF `DateTimeOriginal`). Values with no timezone offset are
+plus camera-raw `.arw`/`.cr2`/`.dng`/`.raw` (all via exiftool's EXIF
+`DateTimeOriginal` — raw formats carry standard EXIF too). Values with no timezone offset are
 interpreted as this machine's local time (DST-aware) — run it somewhere
 with the same system timezone the footage was actually shot in. Placeholder
 "clock never set" timestamps some cameras write (e.g. literal