fix(hooks): slug generator respects configured default model

The slug generator was always using the hardcoded DEFAULT_MODEL (Opus)
because it never passed provider/model to runEmbeddedPiAgent. Now it
resolves the user's configured primary model via resolveConfiguredModelRef.

Closes #4315

src/hooks/llm-slug-generator.ts

@@ -5,6 +5,8 @@
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
+import { DEFAULT_MODEL, DEFAULT_PROVIDER } from "../agents/defaults.js";
+import { resolveConfiguredModelRef } from "../agents/model-selection.js";
 import { runEmbeddedPiAgent } from "../agents/pi-embedded.js";
 import type { OpenClawConfig } from "../config/config.js";
 import {
@@ -38,6 +40,13 @@ ${params.sessionContent.slice(0, 2000)}
 
 Reply with ONLY the slug, nothing else. Examples: "vendor-pitch", "api-design", "bug-fix"`;
 
+    // Respect the user's configured default model instead of always using Opus.
+    const modelRef = resolveConfiguredModelRef({
+      cfg: params.cfg,
+      defaultProvider: DEFAULT_PROVIDER,
+      defaultModel: DEFAULT_MODEL,
+    });
+
     const result = await runEmbeddedPiAgent({
       sessionId: `slug-generator-${Date.now()}`,
       sessionKey: "temp:slug-generator",
@@ -46,6 +55,8 @@ Reply with ONLY the slug, nothing else. Examples: "vendor-pitch", "api-design",
       agentDir,
       config: params.cfg,
       prompt,
+      provider: modelRef.provider,
+      model: modelRef.model,
       timeoutMs: 15_000, // 15 second timeout
       runId: `slug-gen-${Date.now()}`,
     });