fix: align embedded runner with session API changes

src/agents/pi-embedded-runner/compact.ts

@@ -1,6 +1,7 @@
 import {
   createAgentSession,
   estimateTokens,
+  DefaultResourceLoader,
   SessionManager,
   SettingsManager,
 } from "@mariozechner/pi-coding-agent";
@@ -64,7 +65,11 @@ import { log } from "./logger.js";
 import { buildModelAliasLines, resolveModel } from "./model.js";
 import { buildEmbeddedSandboxInfo } from "./sandbox-info.js";
 import { prewarmSessionFile, trackSessionManagerAccess } from "./session-manager-cache.js";
-import { buildEmbeddedSystemPrompt, createSystemPromptOverride } from "./system-prompt.js";
+import {
+  applySystemPromptOverrideToSession,
+  buildEmbeddedSystemPrompt,
+  createSystemPromptOverride,
+} from "./system-prompt.js";
 import { splitSdkTools } from "./tool-split.js";
 import { describeUnknownError, mapThinkingLevel, resolveExecToolDefaults } from "./utils.js";
 
@@ -347,7 +352,7 @@ export async function compactEmbeddedPiSessionDirect(
       userTimeFormat,
       contextFiles,
     });
-    const systemPrompt = createSystemPromptOverride(appendPrompt);
+    const systemPromptOverride = createSystemPromptOverride(appendPrompt);
 
     const sessionLock = await acquireSessionWriteLock({
       sessionFile: params.sessionFile,
@@ -383,6 +388,13 @@ export async function compactEmbeddedPiSessionDirect(
         sandboxEnabled: !!sandbox?.enabled,
       });
 
+      const resourceLoader = new DefaultResourceLoader({
+        cwd: resolvedWorkspace,
+        agentDir,
+        settingsManager,
+        additionalExtensionPaths,
+      });
+      await resourceLoader.reload();
       const { session } = await createAgentSession({
         cwd: resolvedWorkspace,
         agentDir,
@@ -394,11 +406,9 @@ export async function compactEmbeddedPiSessionDirect(
         customTools,
         sessionManager,
         settingsManager,
-        systemPrompt,
-        additionalExtensionPaths,
-        skills: [],
-        contextFiles: [],
+        resourceLoader,
       });
+      applySystemPromptOverrideToSession(session, systemPromptOverride);
 
       try {
         const prior = await sanitizeSessionHistory({