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## What changed - Add a policy prompt and output contract for synchronous Guardian reviews. - Build reviewer thread options with a preferred review model, low reasoning effort when supported, and a fallback to the parent model and effective effort. - Isolate reviewer sessions from parent instructions, MCP servers, optional features, and write access while preserving read restrictions, resolved environments, managed network constraints, and rollout persistence. - Mark prepared threads as internal Guardian review sessions for later host-managed startup. ## Testing - Cover reviewer isolation, read-only environment inheritance, review-model overrides, and parent-model fallback behavior. GitOrigin-RevId: 5133be99674b64e06e19e7f2dbc86439e1678790