feat(environments): expose Environments and Deployments (Free)

[polaz]

👍 React to this issue if you need this feature — helps us prioritise.

Problem

Environments + Deployments are the source of truth for "what version of X is running where". Useful for incident triage, deployment audit, manual env stops. Two competing MCP servers cover this; we don't.

Investigation done (current state)

Verified against src/entities/:

• ❌ grep -ri 'deployment' src/entities/ returns 0 hits
• ❌ No entity environments/ or deployments/
• ❌ environment hits exist (170) but all in registry-manager.ts/handlers.ts referring to runtime env, not GitLab Environments

Re-verify before coding:

grep -rIni 'gitlab.*environment\|/environments' src/entities/
ls src/entities/ | grep -iE 'env|deploy'

Acceptance criteria

• New entity src/entities/environments/ with:
  • browse_environments actions: list, get, list_deployments (within env)
  • manage_environment actions: create, update, stop, delete
• Optional: pair with new browse_deployments / manage_deployment (manual deployment status update)
• Integration test using existing test project + creating a manual deployment

GitLab API

• Endpoints: /projects/:id/environments, /projects/:id/deployments
• Tier: Free
• Docs: https://docs.gitlab.com/api/environments/ and .../deployments/

Estimate

1d

Context

Found during GitLab 18→19 API landscape analysis.