/** * ProviderAdapter - Provider-specific runtime adapter contract. * * Defines the provider-native session/protocol operations that `ProviderService` * routes to after resolving the target provider. Implementations should focus * on provider behavior only and avoid cross-provider orchestration concerns. * * @module ProviderAdapter */import type {  ApprovalRequestId,  ProviderApprovalDecision,  ProviderKind,  ProviderRuntimeEvent,  ProviderSendTurnInput,  ProviderSession,  ProviderSessionId,  ProviderSessionStartInput,  ProviderThreadId,  ProviderTurnId,  ProviderTurnStartResult,} from "@t3tools/contracts";import type { Effect } from "effect";import type { Stream } from "effect"; export interface ProviderThreadTurnSnapshot {  readonly id: ProviderTurnId;  readonly items: ReadonlyArray<unknown>;} export interface ProviderThreadSnapshot {  readonly threadId: ProviderThreadId;  readonly turns: ReadonlyArray<ProviderThreadTurnSnapshot>;} export interface ProviderAdapterShape<TError> {  /**   * Provider kind implemented by this adapter.   */  readonly provider: ProviderKind;   /**   * Start a provider-backed session.   */  readonly startSession: (    input: ProviderSessionStartInput,  ) => Effect.Effect<ProviderSession, TError>;   /**   * Send a turn to an active provider session.   */  readonly sendTurn: (    input: ProviderSendTurnInput,  ) => Effect.Effect<ProviderTurnStartResult, TError>;   /**   * Interrupt an active turn.   */  readonly interruptTurn: (    sessionId: ProviderSessionId,    turnId?: ProviderTurnId,  ) => Effect.Effect<void, TError>;   /**   * Respond to an interactive approval request.   */  readonly respondToRequest: (    sessionId: ProviderSessionId,    requestId: ApprovalRequestId,    decision: ProviderApprovalDecision,  ) => Effect.Effect<void, TError>;   /**   * Stop one provider session.   */  readonly stopSession: (sessionId: ProviderSessionId) => Effect.Effect<void, TError>;   /**   * List currently active provider sessions for this adapter.   */  readonly listSessions: () => Effect.Effect<ReadonlyArray<ProviderSession>>;   /**   * Check whether this adapter owns an active session id.   */  readonly hasSession: (sessionId: ProviderSessionId) => Effect.Effect<boolean>;   /**   * Read a provider thread snapshot.   */  readonly readThread: (    sessionId: ProviderSessionId,  ) => Effect.Effect<ProviderThreadSnapshot, TError>;   /**   * Roll back a provider thread by N turns.   */  readonly rollbackThread: (    sessionId: ProviderSessionId,    numTurns: number,  ) => Effect.Effect<ProviderThreadSnapshot, TError>;   /**   * Stop all sessions owned by this adapter.   */  readonly stopAll: () => Effect.Effect<void, TError>;   /**   * Canonical runtime event stream emitted by this adapter.   */  readonly streamEvents: Stream.Stream<ProviderRuntimeEvent>;}