feat(backend): ThtRunner.ollamaEnsure (parses tht ollama ensure --json)

backend/src/tht/tht-runner.ts

@@ -26,6 +26,15 @@ export interface SessionDocument {
   content: string;
 }
 
+export interface OllamaEnsureResult {
+  ok: boolean;
+  stage?: string;
+  error?: string;
+  server?: string;
+  model?: string;
+  model_name?: string;
+}
+
 export class ThtRunner {
   constructor(private cfg: ThtConfig) {}
 
@@ -129,4 +138,19 @@ export class ThtRunner {
   unarchive(id: string) { return this.ok(["session", "unarchive", id]); }
   deleteSession(id: string) { return this.ok(["session", "delete", id]); }
   documents(id: string) { return this.json<SessionDocument[]>(["session", "documents", id, "--json"]); }
+
+  async ollamaEnsure(workspace: string, timeoutSec: number): Promise<OllamaEnsureResult> {
+    const { code, stdout, stderr } = await this.run(
+      ["ollama", "ensure", "--json", "--timeout", String(timeoutSec)],
+      workspace,
+    );
+    let parsed: Partial<OllamaEnsureResult> = {};
+    try { parsed = JSON.parse(stdout.trim() || "{}"); } catch { /* leave {} */ }
+    if (code === 0) return { ok: true, ...parsed };
+    return {
+      ok: false,
+      stage: parsed.stage,
+      error: parsed.error ?? (stderr.trim() || `tht ollama ensure exit ${code}`),
+    };
+  }
 }