f0db219ee8
Adds a create_label write-mode tool so labels can be created in a repository
through the MCP server (previously there was no way to define labels, which
blocked attaching labels to issues). Follows the full tool checklist:
- arguments.py: CreateLabelArgs (name, hex color, optional description/exclusive),
with extra=forbid and a hex-color pattern.
- gitea_client.py: create_label() POSTing to /repos/{owner}/{repo}/labels with
url-encoded path segments.
- write_tools.py: create_label_tool handler; normalizes the color to a leading
'#', bounds text output, and lets auth/authz errors surface.
- mcp_protocol.py: register create_label (write_operation=True).
- server.py: wire create_label into TOOL_HANDLERS.
- docs/api-reference.md: document create_label.
- tests: success path, color normalization, and invalid-color rejection.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>