feat: add scoped history and artifacts

src/runtime/opencode.ts

@@ -397,6 +397,25 @@ export class OpencodeRuntimeAdapter {
     }
   }
 
+  async cancelPendingUserInput(sessionId: string, id: string): Promise<ResponseInput> {
+    const item = (await this.listPendingUserInputs(sessionId)).find((input) => input.id === id);
+    if (!item) throw Object.assign(new Error("Message has already been consumed or is unavailable"), { status: 409 });
+    const client = await this.ensureClient();
+    try { await client.session.inbox.cancel({ sessionID: sessionId, inboxID: id }); }
+    catch (error) {
+      if (!(await this.listPendingUserInputs(sessionId)).some((input) => input.id === id)) {
+        throw Object.assign(new Error("Message has already been consumed or is unavailable"), { status: 409 });
+      }
+      throw error;
+    }
+    // Native cancel also succeeds for an already consumed ID. Check the native
+    // message record so a delivery racing cancellation never restores a sent draft.
+    if (await this.agentMessageState(sessionId, id) !== "missing") {
+      throw Object.assign(new Error("Message has already been consumed or is unavailable"), { status: 409 });
+    }
+    return { ...item, status: "cancelled" };
+  }
+
   async prompt(sessionId: string, text: string, model?: RuntimeModelOverride) {
     const client = await this.ensureClient();
     const startedAt = Date.now();