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 — mounts, network, tmpfs, add-host, user — introduced in commit 61b72dc) exists in the codebase but is not listed in the AGENTS.md architecture tree under src/compile/extensions/, causing the tree to drift from the actual module layout	AGENTS.md

Applied Fixes

• Added container_runtime.rs entry to the src/compile/extensions/ section of the AGENTS.md architecture tree, with a one-line description matching the module's doc comment (//! Typed Docker runtime configuration for MCPG stdio servers.)

Notes

Verified by diffing find src -type f -name '*.rs' against every file path referenced in the AGENTS.md tree; container_runtime.rs was the only architecturally-relevant, non-test module missing. Confirmed it is a real, currently-used module (mod container_runtime; and its ContainerRuntimeConfig/Mount/Network/Tmpfs/AddHost/ContainerUser types are imported and used in src/compile/extensions/mod.rs). Cross-checked docs/mcp.md and docs/extending.md — the front-matter-facing mounts:/args: fields are already documented there at the user-facing level, so no other doc page needed updates; this module is purely the internal typed representation, appropriately placed only in the architecture-tree index per the project's index-and-delegate model. No other inconsistencies were found across docs/cli.md, docs/safe-outputs.md, docs/front-matter.md, or prompts/*.md in this pass — CLI commands, safe-output tool coverage, front-matter fields, and prompt guidance (including the DEFAULT_COPILOT_MODEL reference and mode: synthetic/mode: policy guidance) all matched current source.

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