docs: add missing container_runtime.rs module to AGENTS.md architecture tree

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	src/compile/extensions/container_runtime.rs — a real, registered (mod container_runtime; in src/compile/extensions/mod.rs) module providing Mount/MountMode and ContainerRuntimeConfig/ContainerRuntimeBuilder for typed Docker runtime configuration of MCPG stdio servers — was absent from the extensions/ subtree in AGENTS.md's architecture map, even though every sibling extension file (ado_aw_marker.rs, github.rs, safe_outputs.rs, ado_script.rs, azure_cli.rs, tests.rs) was listed.	AGENTS.md

Applied Fixes

• Added a container_runtime.rs entry to the extensions/ tree in AGENTS.md, describing its role (Mount/MountMode bind-mount types + ContainerRuntimeConfig/ContainerRuntimeBuilder) and consumers (extensions launching MCPG backends in containers).

Notes

Verified by diffing find src -type f -name '*.rs' against every file mentioned in AGENTS.md's architecture tree. All other modules, the docs/ index, docs/cli.md (against the clap Commands enum in src/main.rs), docs/front-matter.md (against FrontMatter in src/compile/types.rs), docs/safe-outputs.md (against every module in src/safe_outputs/), and the three prompts/*.md workflow-authoring guides were checked and found consistent with current code — no other drift was found this run.

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Created by the agent-documentation maintainer workflow.

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