Split album-metadata.source.sh into focused modules (6r0)

album-metadata.source.sh aggregated six unrelated concerns. Move each
along its existing seam (pure mechanical move, no logic changes):

- EXIF presentation (photo_exif_details_html, tooltip helpers, the
  _photo_exif_values_to wrapper) stays in album-metadata.source.sh,
  which is now EXIF-presentation only.
- File counting (count_files, count_incoming_images, count_tree_files)
  -> image.source.sh, which already owns incoming_image_files;
  count_incoming_images is a direct wrapper of it.
- Tarball naming (tarball_name_plan, generated_tarball_name) ->
  archive.source.sh, which already owns tarball()/resolve_tar_opts.
- Generation metadata + JSON (_collect_generation_metadata,
  _generation_metadata_json, write_generation_metadata) -> new
  generation-metadata.source.sh.
- Dry-run (dry_run, collect_dry_run_*, print_dry_run_plan) -> new
  dry-run.source.sh.
- clear_exif_cache -> metadata-cache.source.sh, next to the cache
  primitive cached_photo_identify_output.

LIB_SOURCES (Justfile + src/shuriken.sh): insert generation-metadata
and dry-run right after album-metadata, before album-render/album.
They depend on image, archive, template and metadata-cache (all earlier
or runtime-only calls), and are consumed by the album coordinator and
the dry-run CLI action, which come later. bin/shuriken regenerated via
just build. File-header comments updated to reflect the new homes.

just test, just shellcheck, just check-generated and git diff --check
all pass.

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

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