Filenames like `000227580005.jpg` (film-scan ID) and
`IMG_21323906751390.jpeg` were matched by the 10-16 digit timestamp
regex and resolved to 1970 / 2037, then written into
`image_exif.date_taken` with `source = 'filename'`. EXIF-less
photos showed up under those bogus dates everywhere date_taken is
read.
Two new guards in `extract_date_from_filename`:
- leading zero → reject (real epoch values don't have one at any
sane resolution).
- resolved year outside [1995, now+1y] → reject.
Both let the date_resolver waterfall fall through to fs_time,
which is a much better proxy for content age than a fake epoch
date. Regression tests cover the two reported filenames.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>