Native GitLab MR review integration — fetch diff and post review comments

[FrankTub]

When using /review with a GitLab merge request URL, it would be great if altimate-code could:

1. Fetch the MR diff directly from GitLab (via API), so the user doesn't need to have the branch checked out locally.
2. Post the review results as MR comments/notes back to the GitLab merge request, so the feedback is visible to the whole team — not just in the terminal.

This would enable a workflow like:

/review https://gitlab.com/org/repo/-/merge_requests/123

→ altimate-code fetches the diff, runs the review, and posts structured comments (bugs, style issues, suggestions) directly on the MR.

The current GitLab MCP server (@modelcontextprotocol/server-gitlab) lacks the necessary tools (no MR diff fetching, no MR commenting). This would need either an enhanced MCP server or native GitLab API integration in altimate-code.

Key GitLab API endpoints needed:

• GET /projects/:id/merge_requests/:mr_iid/changes (fetch diff)
• POST /projects/:id/merge_requests/:mr_iid/notes (post general comment)
• POST /projects/:id/merge_requests/:mr_iid/discussions (post inline/line-level comments)

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Metadata

Field	Value
CLI Version	0.5.13
Platform	darwin
Architecture	arm64
OS Release	25.3.0
Category	feature
Working Directory	data-warehouse-etl-dbt
Session ID	ses_2b15fbc16ffeWAMkfAC5PSUC8r

[anandgupta42]

Resolved in v0.5.18.