9n0 warn on identify failure instead of caching empty EXIF

cached_photo_identify_output() swallowed all ImageMagick errors with
'imagemagick_identify ... || true', so a corrupt photo or identify
failure left the cache with only the signature line and no EXIF. That
signature-only file was a valid-looking cache hit, so the photo rendered
with empty tooltip/stats and the failure was never retried or warned
about again.

Now capture identify's exit status; on failure, log_warning naming the
photo and rm -f the cache file so the next run retries instead of
reusing an empty result. The function still returns 0 so one unreadable
photo does not abort generation (it runs in backgrounded render jobs
under set -euo pipefail) -- the photo just renders without EXIF, now
with a warning.

Adds tests/cli.sh test_generate_warns_and_skips_cache_on_identify_failure
and a TEST_IMAGEMAGICK_IDENTIFY_FAIL hook in the fake ImageMagick to
drive a failing identify; asserts exit 0, a warning naming the photo,
the photo still rendered, and that the failed photo's cache is absent
while a successful photo's cache is present.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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