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 exists in the codebase (typed Docker runtime configuration shared by MCPG stdio servers — ContainerRuntimeConfig, Mount, Network, Tmpfs, ContainerUser, AddHost, re-exported and used by src/compile/common.rs) but was missing from the src/compile/extensions/ listing in AGENTS.md's architecture tree, which otherwise enumerates every file in that directory.

Applied Fixes

• Added a container_runtime.rs entry to the src/compile/extensions/ tree in AGENTS.md with an accurate one-line description of its role.

Notes

Verified against the codebase:

• find src/compile/extensions -type f vs the AGENTS.md tree showed container_runtime.rs was the only omission.
• Confirmed the module is a shared types module (not a CompilerExtension impl) by checking the Extension enum in src/compile/extensions/mod.rs (extension_enum! macro) — it correctly does not appear there, so no other doc (e.g. docs/extending.md's "Always-on extensions" list) needed changes.
• Audited docs/cli.md against the Commands enum in src/main.rs, docs/safe-outputs.md's tool matrix against src/safe_outputs/ and the name = "..." registrations in src/mcp.rs, and prompts/*.md against src/engine.rs (DEFAULT_COPILOT_MODEL) and front-matter fields in src/compile/types.rs. All of these were found accurate and consistent — no further changes made this run.

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