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>
156ced997eJulius Marminge committed on 9/5/2026, 4:54:23 AMparent160e0d3
1 file changedLine totals unavailable