docs: list container_runtime.rs in AGENTS.md architecture tree

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	src/compile/extensions/container_runtime.rs (typed Docker runtime config: Mount/MountMode, Network, Tmpfs, ContainerUser, AddHost, used by MCPG stdio server config and runtime extensions such as Lean) exists in the codebase but was missing from the extensions/ subtree listing in AGENTS.md, making the architecture map incomplete for agents relying on it as an index.	AGENTS.md

Applied Fixes

• Added a container_runtime.rs entry to the src/compile/extensions/ tree in AGENTS.md with a short description of its role and consumers.

Notes

Verified by diffing find src -name '*.rs' against files mentioned in AGENTS.md, then confirming via grep/src/compile/extensions/mod.rs that container_runtime is a real, actively-used module (re-exported types consumed in src/compile/common.rs MCPG mount building and src/runtimes/lean/extension.rs), not dead code. No other drift was found in docs/cli.md, docs/front-matter.md, docs/safe-outputs.md, or prompts/*.md during this pass — CLI commands, safe-output tool names, and front-matter fields all matched current source.

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Created by the agent-documentation maintainer workflow.

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