[business_analysis] Review and unify model provider interfaces

Task 8784 · Done · Business analysis · created · updated

_Automatically composed from the parent epic at dispatch time._

Outcome

PRD settled: all 6 providers + ACP agents; build an Antigravity ACP shim (no TUI scraping) plus the top 3–5 ranked unification ideas, file the rest; ACP stays the wire; proof is a dev run per provider lane. Memory: none applied.

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