Add database/annotations.py (AnnotationOperations, mixed into
PromptDatabase): read_image_tags, replace_image_tags and add_image_tags
run in one _pair_transaction fenced by the storage epoch, own the byte
record by exact locator and digest, always supply UUID ids, rewrite the
ordered junction and bump tag_revision plus image_index_revision.
Revision mismatches raise AnnotationCommandError("tag-conflict") with
the current set; the identical set at the current or previous revision
is replayed without writes; a union over 100 names is "tag-limit".
normalize_image_tags validates each name with validate_vocabulary_tag_name
and folds case-insensitive repeats keeping the first spelling.
refresh_image_fingerprint, current_image_tags (chunked, fingerprint
matched, newest verification wins) and iter_image_tag_records serve the
S1 cheap reads.
Vocabulary participation: _move_tag_links also carries media_image_tags,
legacy merge_tags moves image-only sources, tag rows gain image_count
(files with any byte record carrying the tag), impact gains images and
rename/delete receipts gain images_changed. vocabulary-state.mjs accepts
the optional counts and names images in the delete text.
Browser fixtures clear the three annotation data tables on reset (never
the metadata row); TESTING.md documents the schema beside favorites.
