Brainstorming
Turn the PM's intent into a design spec through collaborative dialogue. The PM decides what to build; the EM shapes feasibility, flags constraints, and proposes approaches. The output is a committed spec that feeds directly into coordinator:plan.
Announce at start: "Using brainstorming to explore the design before we plan implementation."
When NOT to invoke: Well-scoped follow-ups (PM is asking for a specific next step on a workstream that already has a spec, plan, o
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