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George Cushen
bdd3820f27
Adds the metadata pipeline that makes the gallery block self-curating.
Per-image metadata now resolves through a four-tier waterfall, first
non-empty source wins:
1. Frontmatter (items[].caption etc.)
2. Sidecar file next to the image - tries six patterns:
<name>.yaml / .yml / .json and <basename>.yaml / .yml / .json,
looked up in both site assets and the page bundle (covers album
mode and page-resource mode alike).
3. Embedded IPTC/EXIF via Hugo's .Exif.Tags - caption from
Caption-Abstract / ImageDescription / XPSubject / Description,
credit from By-line / Artist / Creator. Wrapped in `try` so
non-EXIF formats and bad metadata never break the build.
4. Humanised filename - alt fallback only; captions stay empty
rather than fabricated from filenames.
Also adds a third source mode - content.page_resources: true -
auto-discovers image resources attached to the current page bundle.
Drop-in for blog posts and project pages where photos live next to
index.md; sidecar lookup works inside the bundle too.
Fixes a leading-slash quirk: Resource.Name returns "/media/..." for
site assets but a bare path for page-bundle resources; the path is
now normalised so sidecar lookups land in either layout.
Test site adds two sidecar YAML files (04-cabin.jpg.yaml and
06-mountain.jpg.yaml) - the masonry album demo now picks up titles,
markdown captions, and links from those sidecars without listing any
items[].