Execute-family controller recipe

One home for controller steps and runtime state shared across build-in-waves, build-by-story, and build-inline. Each route owns only its mode iron law and scheduler/unit behavior. The shared task lifecycle is in task-lifecycle.md beside this file. Load this file when that skill's Setup or After-last step says to.

This folder is a registered Engineer Pack skill so npx skills add copies it beside the execute-family skills.

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