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

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	src/compile/extensions/container_runtime.rs exists, is registered via mod container_runtime; in src/compile/extensions/mod.rs, and defines the typed Docker runtime configuration used for MCPG stdio servers (Mount, MountMode, Network, AddHost, ContainerUser, Tmpfs, ContainerRuntimeConfig, ContainerRuntimeBuilder), but it was missing from the extensions/ subtree listing in AGENTS.md.	AGENTS.md

Applied Fixes

• Added a container_runtime.rs entry to the src/compile/extensions/ tree in AGENTS.md, describing its role (typed Docker runtime configuration for MCPG stdio servers: mounts, network mode, add-host, user, tmpfs).

Notes

Verified by diffing find src -type f -name '*.rs' against every .rs basename referenced in AGENTS.md's architecture tree. All other files listed in the tree (including sibling extensions/ modules, ir/, codemods/, exec_context/, safe_outputs/, runtimes/, tools/, shell/, imports/, audit/, and inspect/) were cross-checked against the actual directory contents and matched. I also spot-checked docs/cli.md against src/main.rs's Commands enum, docs/safe-outputs.md against every file in src/safe_outputs/, and docs/front-matter.md/docs/engine.md against FrontMatter/DEFAULT_COPILOT_MODEL in src/compile/types.rs / src/engine.rs — no further drift found this run, so this single accuracy fix is the only change.

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Created by the agent-documentation maintainer workflow.

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