[architecture] Review and unify model provider interfaces

Task 8785 · Done · Architecture · created · updated

_Automatically composed from the parent epic at dispatch time._

Outcome

Antigravity → ACP via Google's pinned agy_acp_server (child A, after child 3); I1–I5 unify writes, credential reads, ACP dialect, session walk and hooks (children 1–5); V proves each lane live on dev. F1–F7 filed. Memory: proposed 1 env.

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