[business_analysis] Refactor Provider and Authentication Type Feature

Task 9913 · Done · Business analysis · created · updated

_Automatically composed from the parent epic at dispatch time._

Outcome

PRD settled: provider × auth-type grid becomes one plan term (plan → (default), org override in a new Providers tab), covering SDK and ACP-registry agents. It retires the system default, org Providers tab and Non-Claude switch, with a migration that preserves access. 14 ACs. Memory: none applied.

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