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 (583 lines, defines Mount, Network, Tmpfs, AddHost, ContainerUser, ContainerRuntimeConfig used across the compiler's MCPG/container-invocation code) was entirely missing from the extensions/ architecture-tree listing in AGENTS.md	AGENTS.md

Applied Fixes

• Added a container_runtime.rs entry to the extensions/ subtree in AGENTS.md, describing it as the typed Docker runtime config shared by MCPG stdio servers

Notes

Audited AGENTS.md's architecture tree against find src -type f -name '*.rs' (basename diff), confirming every other source file is represented (either individually or, for large directories like ir/tasks/ with 57 files, via an accurate summarized description). Cross-checked the documentation index against ls docs/*.md (bidirectional — no orphaned pages, no dead links). Spot-checked docs/cli.md vs the Commands enum in src/main.rs, docs/engine.md vs EngineOptions/EngineConfig in src/compile/types.rs, docs/network.md vs CORE_ALLOWED_HOSTS in src/allowed_hosts.rs, docs/tools.md vs ToolsConfig, docs/parameters.md vs PipelineParameter, docs/codemods.md vs the codemod registry, docs/ado-aw-debug.md vs AdoAwDebugConfig, and all three prompts/*.md workflow-authoring guides against current compiler behavior (e.g., the "no compiler-selected default model" claim against src/engine.rs) — all found accurate and consistent. This was the only concrete drift located this run.

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[jamesadevine]

Closed as superseded by aggregate PR #2189, which integrates the reviewed change.