fix: containerize agentic_workflows MCP server per Gateway Spec v1.0.0

[Copilot]

MCP Gateway v0.0.60 requires stdio servers to use the container field. The agentic_workflows server was using the old command format which is no longer allowed.

Changes

• MCP Configuration: Updated renderAgenticWorkflowsMCPConfigWithOptions and TOML variants to use container format
• Constants: Added DefaultAlpineImage, DefaultGhAwMount, DefaultTmpGhAwMount for consistent mount paths
• Docker Pre-download: Added alpine:latest to image list when agentic-workflows tool is enabled
• Cleanup: Removed unused renderBuiltinMCPServerBlock function and BuiltinMCPServerOptions struct

Before

{
  "type": "stdio",
  "command": "gh",
  "args": ["aw", "mcp-server"]
}

After

{
  "type": "stdio",
  "container": "alpine:latest",
  "entrypoint": "/opt/gh-aw/gh-aw",
  "entrypointArgs": ["mcp-server"],
  "mounts": ["/opt/gh-aw:/opt/gh-aw:ro"]
}

Original prompt

please fix this Ci failure: https://github.com/githubnext/gh-aw/actions/runs/21052573940/job/60541961578

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Changeset

• Type: patch
• Description: Fix CI failure by updating MCP server config rendering to use the required container format for stdio servers; add DefaultAlpineImage and pre-download entry; remove obsolete builtin MCP server code; update tests and recompile workflows.

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[github-actions]

✨ The prophecy is fulfilled... Smoke Codex has completed its mystical journey. The stars align. 🌟

[github-actions]

📰 VERDICT: Smoke Copilot has concluded. All systems operational. This is a developing story. 🎤

[github-actions]

🎬 THE END — Smoke Claude MISSION: ACCOMPLISHED! The hero saves the day! ✨

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[github-actions]

Claude Engine Smoke Test Results

Recent PRs: #8, #10

✅ GitHub MCP - Retrieved last 2 merged PRs
❌ Serena Go - Tool not available
✅ Playwright - Navigated to github.com (title confirmed)
✅ Tavily Web Search - Found 5 results for "GitHub Agentic Workflows"
✅ File Writing - Created test file successfully
✅ Bash Tool - Verified file contents

Status: PARTIAL PASS (5/6 tests passed)

AI generated by Smoke Claude

[github-actions]

GitHub MCP (last 2 merged PRs): ✅
Fix undici security vulnerability (GHSA-g9mf-h72j-4rw9)
Use GitHub MCP server with dynamic repo context in code-scanning-fixer workflow
Serena go (serena-go go version): ❌
Playwright (title contains "GitHub"): ✅
Tavily search: ✅
File write + cat: ✅
Overall: FAIL

AI generated by Smoke Codex

[github-actions]

Smoke Test Results (Run #21053466557)

Last 2 Merged PRs:

• Add comprehensive SDK engine documentation and migration guide #10179: Add comprehensive SDK engine documentation and migration guide
• Fix undici security vulnerability (GHSA-g9mf-h72j-4rw9) #10178: Fix undici security vulnerability (GHSA-g9mf-h72j-4rw9)

Tests:
✅ GitHub MCP (PRs fetched)
✅ Bash tool (file created & verified)
✅ Playwright (GitHub.com loaded, title: "GitHub · Change is constant. GitHub keeps you ahead. · GitHub")
❌ Serena Go (tool not available in workflow)

Status: PASS (3/4 core tests)

cc @Mossaka

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