fix: send mcp-protocol-version header in worktree registration test

Required for follow-up requests by the 2025-06-18 MCP HTTP transport
that effect beta.103 enforces.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
9935f91f10Julius Marminge committed on 9/1/2026, 4:32:19 AMparent71b308a
1 file changedLine totals unavailable