Module model 

Domain model for LinkMarks.

Invariants:

• original_url is never rewritten. Round-trip fidelity.
• canonical_url is the dedupe key, normalized by canonical.
• tags are sorted, lowercase, deduplicated at the model boundary.
• collection is a /-separated folder path, normalized.
• Timestamps are UTC ISO 8601.

Structs

Bookmark

A normalized bookmark record.

BookmarkId

Opaque bookmark identifier. ULID by default; may be locally generated UUIDs in v0. Server-assigned in CRDT mode.

Collection

A collection (folder) grouping bookmarks.

CollectionId

Opaque collection identifier.

SourceRef

Source provenance.

Tag

Tag newtype. Validates lowercase + non-empty on construction.

Enums

SourceKind

Enumerates the source kinds supported by core + bridges.