The seed, expand, and collect stages each had their own near-identical
resolve_entity_ref helper that converted internal DB IDs to full EntityRef
structs. This duplication made it easy for bug fixes to land in one copy
but not the others.
Extract a single public resolve_entity_ref into timeline.rs with an
optional project_id parameter:
- Some(project_id): scopes the lookup (used by seed, which knows the
project from the FTS result)
- None: unscoped lookup (used by expand, which traverses cross-project
references)
Also changes UnresolvedRef.target_iid from i64 to Option<i64>. Cross-
project references parsed from descriptions may not always carry an IID
(e.g. when the reference is malformed or the target was deleted). The
previous sentinel value of 0 was semantically incorrect since GitLab IIDs
start at 1.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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