[docs] Update documentation for sandbox.mcp command/container execution modes

[github-actions]

Documentation Updates - 2025-12-22

This PR updates the documentation based on features merged in the last 24 hours.

Features Documented

• sandbox.mcp command/container execution support (from Add command/container execution support to sandbox.mcp configuration #7294)
  • Added documentation for the new command field in sandbox.mcp configuration
  • Clarified that command and container fields are mutually exclusive
  • Updated table to show both fields as optional (not required)
  • Added clear execution mode descriptions (custom command, container, default awmg)
  • Added three practical examples showing each execution mode

Changes Made

• Updated docs/src/content/docs/reference/sandbox.md:
  • Revised MCP Gateway Configuration Options table to include command field
  • Changed container field from required to optional
  • Added note explaining the three execution modes and mutual exclusivity
  • Updated "How It Works" section to mention all execution modes
  • Replaced single example with three mode-specific examples

Merged PRs Referenced

• Add command/container execution support to sandbox.mcp configuration #7294 - Add command/container execution support to sandbox.mcp configuration (merged 2025-12-22)
• Add standalone awmg CLI for MCP server aggregation #7050 - Add standalone awmg CLI for MCP server aggregation (merged 2025-12-22)
• Standardize CLI argument syntax for consistency #7296 - Standardize CLI argument syntax for consistency (merged 2025-12-22, already reflected in CLI docs)

Analysis Summary

Reviewed 10 PRs merged in the last 24 hours:

• PR Add standalone awmg CLI for MCP server aggregation #7050 (awmg CLI) - Already documented in docs/awmg.md and docs/mcp-gateway.md
• PR Add command/container execution support to sandbox.mcp configuration #7294 (sandbox.mcp command/container) - Documentation added in this PR
• PR Standardize CLI argument syntax for consistency #7296 (CLI argument syntax) - Already reflected in docs/src/content/docs/setup/cli.md
• Other PRs (Mount build tools into agent container for hourly-ci-cleaner #7299, [ca] Document hourly-ci-cleaner tool access issue #7297, Fix choice type conversion to JSON Schema in safe-output jobs #7291, [q] Fix upload-assets not processing files from MCP server #7293, Fix Haskell action SHA in runtime setup test #7288, [security-fix] Fix clear-text logging vulnerability by removing secret key parameter from validation #7289, Add workflow health monitoring runbook #7287) - Internal fixes, security patches, or workflow health monitoring that don't require user-facing documentation updates

Notes

The documentation now accurately reflects the flexibility of the MCP gateway configuration, helping users understand they can:

1. Use the default awmg binary (simplest, no configuration needed)
2. Provide a custom command for specialized gateway implementations
3. Use a Docker container for isolated or advanced gateway setups

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