native macOS codings agent orchestrator prowl.onev.cat

docs(ai): plan Agent Completion Signals (064) and split agents wait out of 063 master

Add the layered signal-bus plan (cooperative / launch-scoped hooks / transcript+process+OSC / heuristic) with prowl agents signal and agents wait, index it, and make 063 reference 064 instead of owning agents wait. Claude-Session: https://claude.ai/code/session_019jRM3FXUGguPFCqWAWu1Yb


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