[log] Add debug logging to container detection

[github-actions]

Summary

Adds comprehensive debug logging to internal/tty/container.go to improve troubleshooting and development visibility when detecting container environments.

Changes

Enhanced the IsRunningInContainer() function with 6 meaningful debug log statements:

1. Function entry - Logs when container detection starts
2. Docker detection - Logs when /.dockerenv file is found
3. cgroup detection - Logs when /proc/1/cgroup contains container indicators
4. Error handling - Logs when /proc/1/cgroup read fails
5. Environment variable detection - Logs when RUNNING_IN_CONTAINER=true
6. Negative case - Logs when not running in a container

Logging Details

• Logger namespace: tty:container (follows pkg:filename convention)
• Import added: github.com/githubnext/gh-aw-mcpg/internal/logger
• No side effects: All log arguments are simple variables or strings
• Control flow coverage: Logs all detection paths including error cases

Testing

The changes follow the project's logging guidelines from AGENTS.md:

• ✅ Logger naming convention followed (tty:container)
• ✅ No side effects in logger arguments
• ✅ Meaningful messages for debugging
• ✅ Function entry logged
• ✅ Control flow decisions logged
• ✅ Error cases logged

Debug Output

When running with DEBUG=tty:* ./awmg, you'll see:

tty:container Detecting container environment
tty:container Container detected: /.dockerenv file exists

Or in non-container environments:

tty:container Detecting container environment
tty:container Failed to read /proc/1/cgroup: open /proc/1/cgroup: permission denied
tty:container Not running in container

This provides valuable insight into how the container detection logic executes in different environments.

AI generated by Go Logger Enhancement

[github-actions]

Smoke Test Results

Last 2 Merged PRs:

• Add logging for unknown tool errors in SDK middleware using error codes #495: Add logging for unknown tool errors
• Fix gateway default mode to routed #492: Fix gateway default mode to routed

Test Results:
✅ GitHub MCP
✅ Serena MCP
✅ Playwright
✅ File Writing
✅ Bash Tool

Overall: PASS

cc: @github-actions

AI generated by Smoke Copilot

[github-actions]

Smoke Test Results - Copilot Engine

PRs Tested: #502 (fixed agent prompt), #500 (changed debug env var)

✅ GitHub MCP
✅ Serena MCP
✅ Playwright
✅ File Writing
✅ Bash Tool

Overall Status: PASS ✅

cc @github-actions[bot]

AI generated by Smoke Copilot