[codex] repair docs MCP indexing

[MuncleUscles]

What changed

• Upgrade the docs MCP image to Node 22 and @arabold/docs-mcp-server@2.4.0.
• Add startup index verification and automatic rebuild when the persisted DB is unusable.
• Start the MCP-only server command and add a shorter SSE heartbeat.
• Fix broken public/llms.txt docs links that were poisoning scraper seed discovery.

Why

The hosted MCP endpoint accepted sessions, but searches failed because the persisted index listed libraries while search_docs/find_version could not resolve them. The scraper could also fail while rebuilding because llms.txt contained links to routes that do not exist.

Validation

• sh -n docs-mcp/entrypoint.sh
• docker build -t genlayer-docs-mcp:test docs-mcp
• Verified built image reports Node v22.22.3 and docs-mcp-server 2.4.0.
• Capped docs scrape with production excludes succeeded and find-version reported usable unversioned docs.
• Capped SDK scrape succeeded and find-version reported usable unversioned docs.
• Checked public/llms.txt docs.genlayer.com links against local page files.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7b9b6031-d98a-49de-8281-aa45d91c51c1

📥 Commits

Reviewing files that changed from the base of the PR and between 5b64908 and f41c15b.

📒 Files selected for processing (3)

• docs-mcp/Dockerfile
• docs-mcp/entrypoint.sh
• public/llms.txt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-docs-mcp

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