docs(commands): add timebox and fresh-sources rules to brainstorm

Three audit fixes. Phase 1 gains a "Timebox the dialogue" rule, since one-question-at-a-time can run long: aim for the one-sentence restatement in roughly five to eight questions, then move to Phase 2 and park the rest as open questions. Phase 2 gains "Ground high-stakes claims in fresh sources" — check load-bearing claims about markets, regulations, tools, vendors, or current APIs against a current source, and mark what you couldn't verify as an assumption. The design-doc skeleton gains an Assumptions section that separates researched facts (with their source) from assumptions to confirm before building.

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