[business_analysis] Support the per-agent pricing model: plan knobs

Task 6715 · Done · Business analysis · created · updated

_Automatically composed from the parent epic at dispatch time._

Outcome

PRD settled: 19 asks (5 plan knobs, 9 features, 5 plans, existing orgs unchanged), each with a dev-console oracle; 13 documented decisions (Telegram re-introduced, team=Group for budgets, reuse team/enterprise keys); prices and marketing site out of scope.

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