重构会话管理功能，由后端 opencode 发放 sessionId，后端做 scope

src/learning/orchestrator.ts

@@ -9,7 +9,10 @@ import { LearningStateStore } from "./stateStore.js";
 import { MemoryStore, type MemoryScope } from "../memory/store.js";
 import { type OpencodeRuntimeAdapter } from "../runtime/opencode.js";
 import { SkillStore } from "../skills/store.js";
-import { ToolSessionContextStore } from "../session/toolContextStore.js";
+import {
+  buildToolSessionScopeKey,
+  ToolSessionContextStore,
+} from "../session/toolContextStore.js";
 import {
   sanitizePersistentDocument,
   sanitizePersistentLine,
@@ -150,6 +153,11 @@ export class LearningOrchestrator {
         projectId: input.requestContext.projectId,
         projectKey: input.requestContext.projectKey,
         sessionId: gateSession.id,
+        sessionScopeKey: buildToolSessionScopeKey(
+          input.requestContext.actorKey,
+          input.requestContext.projectKey,
+          input.requestContext.clientSessionId,
+        ),
         traceId: input.requestContext.traceId,
       });
       await this.runtime.prompt(
@@ -239,6 +247,11 @@ export class LearningOrchestrator {
       projectId: input.requestContext.projectId,
       projectKey: input.requestContext.projectKey,
       sessionId: reviewSession.id,
+      sessionScopeKey: buildToolSessionScopeKey(
+        input.requestContext.actorKey,
+        input.requestContext.projectKey,
+        input.requestContext.clientSessionId,
+      ),
       traceId: input.requestContext.traceId,
     });
     try {