Fix awmg MCP config rewrite by including gateway section in initial config

[Copilot]

The awmg binary requires a gateway section in mcp-config.json to determine the port and settings for rewriting server configurations with gatewayed URLs. The initial config generated by RenderMCPConfig was missing this section, causing the rewrite to fail silently.

Changes:

• pkg/workflow/mcp_renderer.go: Added GatewayConfig field to JSONMCPConfigOptions and updated RenderJSONMCPConfig to write gateway section when provided
• pkg/workflow/copilot_mcp.go: Pass workflowData.SandboxConfig.MCP as GatewayConfig when MCP gateway is enabled
• Recompiled workflows: Updated all workflow lock files with gateway section in MCP configs

Before:

{
  "mcpServers": {
    "github": { "command": "docker", "args": [...] }
  }
}

After:

{
  "mcpServers": {
    "github": { "command": "docker", "args": [...] }
  },
  "gateway": {
    "port": 8080
  }
}

This allows awmg to read the gateway configuration and properly rewrite server entries to use HTTP URLs pointing to http://localhost:8080/mcp/{server}.

Original prompt

Reference: https://github.com/githubnext/gh-aw/actions/runs/20650889297/job/59295622590#step:23:1

awmg is not properly rewriting mcp-config with the update gatewayed url location. Fix it.

See run logs using audit.

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