feat(mcp): SSE/HTTP mode, workplan OPS-WP-0002 done

- Add --http flag to MCP server for SSE transport on port 8002
- Add make mcp-http / mcp-stop targets
- Pin fastmcp<3.1.0 to stabilize dependency
- Update session-protocol: Step 0 tunnel health check before orient
- Mark OPS-WP-0002 and all its tasks done

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -11,7 +11,7 @@ dependencies = [
     "typer>=0.12",
     "pyyaml>=6.0",
     "httpx>=0.27",
-    "fastmcp>=2.0.0",
+    "fastmcp>=2.0.0,<3.1.0",
 ]
 
 [project.scripts]