docs: add missing 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 (defines Mount, MountMode, McpgServerConfig used for typed Docker runtime config on MCPG stdio servers) is missing from the extensions/ subtree in the AGENTS.md architecture map	AGENTS.md

Applied Fixes

• Added a container_runtime.rs entry under src/compile/extensions/ in the architecture tree with a short description of its role

Notes

Verified by diffing every *.rs file under src/ (excluding the intentionally-collapsed ir/tasks/ directory) against files mentioned in AGENTS.md; container_runtime.rs was the only file present in the codebase but absent from the doc. Confirmed via mod.rs (mod container_runtime; pub use container_runtime::{...}) that it is an active, in-tree module, not dead code. No other drift found in the CLI reference, front-matter fields, safe-outputs tool matrix, or workflow-authoring prompts during this pass.

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[jamesadevine]

The same container_runtime.rs architecture entry was already merged through #2189; #2238 records this duplicate disposition. Closing as superseded.