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

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	src/compile/extensions/container_runtime.rs (typed Docker runtime configuration for MCPG stdio servers — ContainerRuntimeConfig, Mount, Network, Tmpfs, etc., used by mod.rs) exists in the codebase but was missing from the src/compile/extensions/ listing in the architecture tree	AGENTS.md

Applied Fixes

• Added a container_runtime.rs entry to the compile/extensions/ subtree in AGENTS.md, describing its role (typed Docker runtime configuration for MCPG stdio servers: mounts, network, user, tmpfs), consistent with the sibling entries in the same block.

Notes

Verified by diffing find src -name '*.rs' against every file path parsed out of the AGENTS.md architecture tree ASCII diagram. This was the only genuine gap found; the rest of the tree, docs/cli.md (CLI commands vs. src/main.rs Commands enum), and the docs/safe-outputs.md GitHub mutation tool matrix (agent parameters and default max values vs. src/safe_outputs/*.rs DEFAULT_MAX/ToolResult impls and src/execute.rs::resolve_max) were all cross-checked against source and found accurate.

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Created by the agent-documentation maintainer workflow.

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