Adds six new types for deserializing responses from GitLab's three
Resource Events API endpoints (state, label, milestone):
- GitLabStateEvent: State transitions with optional user, source_commit,
and source_merge_request reference
- GitLabLabelEvent: Label add/remove events with nested GitLabLabelRef
- GitLabMilestoneEvent: Milestone assignment changes with nested
GitLabMilestoneRef
- GitLabMergeRequestRef: Lightweight MR reference (iid, title, web_url)
- GitLabLabelRef: Label metadata (id, name, color, description)
- GitLabMilestoneRef: Milestone metadata (id, iid, title)
All types derive Deserialize + Serialize and use Option<T> for nullable
fields (user, source_commit, color, description) to match GitLab's API
contract where these fields may be null.
Includes 8 new test cases covering:
- State events with/without user, with/without source_merge_request
- Label events for add and remove actions, including null color handling
- Milestone event deserialization
- Standalone ref type deserialization (MR, label, milestone)
Uses r##"..."## raw string delimiters where JSON contains hex color
codes (#FF0000) that would conflict with r#"..."# delimiters.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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