0fa7beba44
## Summary Fix MCP `/mcp` transport handling for clients using `streamable-http`. ## Changes - add explicit `GET /mcp` and `DELETE /mcp` handlers - return `405 Method Not Allowed` with `Allow: POST` - keep `POST /mcp` protected by MCP auth guards - mark `GET` and `DELETE` as intentionally public with `PublicEndpointGuard` + `NoPermissionGuard` - update the advertised MCP protocol version to `2025-03-26` - add unit and integration coverage for the new behavior ## Why The frontend advertises the MCP server as `streamable-http`, but the backend only effectively handled `POST /mcp`. Some MCP clients probe `GET /mcp` during connection setup, so unsupported methods need explicit method-level responses instead of falling through or being blocked before the handler. ## Validation - verified locally: - `GET /mcp` -> `405` - `DELETE /mcp` -> `405` - unauthenticated `POST /mcp` -> `401` - passed controller unit tests - added integration assertions for `GET` and `DELETE` --------- Co-authored-by: Claude <noreply@anthropic.com> Co-authored-by: Félix Malfait <felix.malfait@gmail.com>