feat: add environment lifecycle and pipeline trigger tools

[Agent-Hellboy]

Closes #682.

Adds environment update/delete/stop/stale-stop/review-app cleanup and pipeline trigger list/get/create/update/delete/run operations.

Validation: npm run build; git diff --check.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 1f7e8f4 and 4185f00.

📒 Files selected for processing (4)

• index.ts
• schemas.ts
• skills/gitlab-mcp/reference/pipelines.md
• tools/registry.ts

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[zereight]

Question on stop_stale_environments: it's registered in both destructiveTools and deleteTools, so GITLAB_PERMISSION_MODE=modify blocks it. It stops environments, it doesn't delete anything — other non-delete write actions like merge/protect/push are allowed in modify mode.

Was blocking it in modify intentional (since it can stop many environments at once), or should it move out of deleteTools to match the merge/protect/push precedent?

[zereight]

stop_stale_environments is registered in both destructiveTools and deleteTools, so GITLAB_PERMISSION_MODE=modify blocks it — but it stops environments, it doesn't delete anything. Other non-delete write actions (merge/protect/push) are allowed in modify mode. Please confirm whether blocking it in modify is intentional, or move it out of deleteTools to match that precedent.