Resolve the canonical MCP config file path.
Prefers $GH_AW_MCP_CONFIG env var, then falls back to ~/.copilot/mcp-config.json.
$GH_AW_MCP_CONFIG
~/.copilot/mcp-config.json
Absolute config file path.
Resolve the canonical MCP config file path.
Prefers
$GH_AW_MCP_CONFIGenv var, then falls back to~/.copilot/mcp-config.json.