7837ff43ad
Adds six opt-in write tools (write-mode + policy + per-user permission still
enforced; no destructive or admin actions):
- create_pull_request (POST /pulls)
- create_release / edit_release (POST/PATCH /releases)
- create_branch (POST /branches; create only, no deletion)
- create_milestone (POST /milestones)
- edit_issue_comment (PATCH /issues/comments/{id})
Each: arg schema (extra=forbid, GitRef on branch/ref-like fields), Gitea client
method with url-encoded path segments, handler that surfaces auth errors, MCP
registration (write_operation=True), server wiring, docs, and success tests.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>