docs: add missing container_runtime.rs entry to AGENTS.md extensions tree

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	src/compile/extensions/container_runtime.rs (583 lines, typed Docker Mount/MountMode config for MCPG stdio-server containers, imported by mod.rs) is a real, actively-used module but was missing from the extensions/ subtree listed in AGENTS.md's architecture map	AGENTS.md

Applied Fixes

• Added a one-line entry for container_runtime.rs under src/compile/extensions/ in the architecture tree, describing its role (typed Docker runtime configuration shared by MCPG stdio-server containers)

Notes

Verified by diffing every .rs filename under src/ against filenames mentioned in AGENTS.md. All other "unmentioned" files were either intentionally summarized (the ir/tasks/ builder directory is described as one collapsed line, per existing convention) or non-source-file text references, so no further action was needed there. Cross-checked docs/cli.md, docs/safe-outputs.md, docs/network.md, docs/parameters.md, docs/tools.md, docs/front-matter.md, docs/schedule-syntax.md, and all three prompts/*.md guides against their corresponding source (src/main.rs Commands enum, src/safe_outputs/, src/allowed_hosts.rs, src/compile/types.rs FrontMatter, src/fuzzy_schedule.rs, src/engine.rs) and found them accurate — no drift beyond the one fix above.

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