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 (typed Docker runtime config: Mount, Network, Tmpfs, AddHost, ContainerUser, re-exported by extensions/mod.rs and used for MCPG stdio server compilation) exists in the codebase but was missing from the extensions/ subtree in AGENTS.md's architecture map.	AGENTS.md

Applied Fixes

• Added a container_runtime.rs line to the extensions/ tree in AGENTS.md, describing it as the shared typed Docker-runtime-config module (not itself a CompilerExtension — verified it has no variant in the Extension enum in src/compile/extensions/mod.rs, unlike its siblings).

Notes

Verified via find src -name '*.rs' diffed against every .rs path referenced in AGENTS.md; this was the only genuine gap outside the intentionally-summarized compile/ir/tasks/ directory. Cross-checked docs/cli.md, docs/front-matter.md, docs/safe-outputs.md (all safe-output tool modules present and documented), the docs/ index links, and prompts/*.md (already source-of-truth-anchored, e.g. pointing at src/engine.rs::DEFAULT_COPILOT_MODEL rather than hardcoding values) — no further drift found in this pass.

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