Add pipe-based gateway launch integration test

[Copilot]

Adds integration test demonstrating gateway launch via pipes (standard pipe and named FIFO), similar to start_mcp_gateway_server.sh pattern in gh-aw.

Changes

Shell Script (test/integration/start_gateway_with_pipe.sh)

• Implements two pipe mechanisms:
  • Standard pipe: echo "$CONFIG_JSON" | awmg --config-stdin
  • Named FIFO: mkfifo → write config → gateway reads from pipe
• Environment-driven configuration (binary path, port, mode, pipe type)
• Cleanup handling with NO_CLEANUP flag for test control

Integration Tests (test/integration/pipe_launch_test.go)

• Tests 4 scenarios: {standard, named} × {routed, unified}
• Validates health checks and MCP initialize flow
• Script validation tests for error paths

Example Usage

# Standard pipe
BINARY=./awmg PORT=8000 MODE=--routed PIPE_TYPE=standard ./start_gateway_with_pipe.sh

# Named pipe (FIFO)
BINARY=./awmg PORT=8001 MODE=--unified PIPE_TYPE=named ./start_gateway_with_pipe.sh

Demonstrates stdin-based config for containerized deployments where file-based config isn't suitable.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/githubnext/gh-aw/git/trees/main
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Add an integration test that uses a shell script similar to the start_mcp_gateway_server.sh in githubnext/gh-aw to launch the gateway using pipes.

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