feat: harden runtime readiness and session workflow

backend/src/tht/tht-runner.ts

@@ -83,8 +83,8 @@ export class ThtRunner {
     return JSON.parse(stdout) as T;
   }
 
-  private async ok(args: string[]): Promise<void> {
-    const { code, stderr } = await this.run(args);
+  private async ok(args: string[], workspace?: string): Promise<void> {
+    const { code, stderr } = await this.run(args, workspace);
     if (code !== 0) throw new Error(`tht ${args.join(" ")} exit ${code}: ${stderr.trim()}`);
   }
 
@@ -109,6 +109,13 @@ export class ThtRunner {
     return this.json<{ id: string }>(a, o.workspace);
   }
 
+  /** Build and persist the deterministic F1 retrieval pack for a new session. */
+  async searchPack(question: string, sessionId: string, workspace?: string): Promise<void> {
+    const args = ["search", "pack", question, "--session", sessionId];
+    const { code, stderr } = await this.run(args, workspace);
+    if (code !== 0) throw new Error(`tht ${args.join(" ")} exit ${code}: ${stderr.trim()}`);
+  }
+
   sessionList(workspace?: string) {
     return this.json<SessionRow[]>(["session", "list", "--json"], workspace);
   }
@@ -137,6 +144,9 @@ export class ThtRunner {
     return { path: stdout.trim() };
   }
 
+  closeSession(id: string, workspace?: string) { return this.ok(["session", "close", id], workspace); }
+  failSession(id: string, workspace?: string) { return this.ok(["session", "fail", id], workspace); }
+  reopenSession(id: string, workspace?: string) { return this.ok(["session", "reopen", id], workspace); }
   setName(id: string, name: string) { return this.ok(["session", "set-name", id, "--name", name]); }
   setGroup(id: string, group: string) { return this.ok(["session", "set-group", id, "--group", group]); }
   archive(id: string) { return this.ok(["session", "archive", id]); }