fix: session_id generated at agent load (not lazy)

src/config.ts

@@ -36,33 +36,6 @@ export interface AgentConfig {
   allowedPaths: string[];
   /** Persistent session UUID — survives renames. Stored in agent.json. */
   sessionId: string;
-  /** Internal: path to config file for lazy session_id write-back */
-  _configPath: string | null;
-  /** Internal: parsed config data for write-back */
-  _configData: Record<string, unknown>;
-}
-
-/**
- * Ensure agent has a persistent session_id.
- * Call lazily on first agent invocation, not at startup.
- * Generates UUID and writes it back to agent.json.
- */
-export function ensureSessionId(config: AgentConfig): string {
-  if (config.sessionId) return config.sessionId;
-
-  const id = crypto.randomUUID();
-  config.sessionId = id;
-
-  if (config._configPath) {
-    try {
-      config._configData.session_id = id;
-      fs.writeFileSync(config._configPath, JSON.stringify(config._configData, null, 2) + '\n');
-    } catch {
-      // Non-fatal
-    }
-  }
-
-  return id;
 }
 
 const homeDir = os.homedir();
@@ -189,8 +162,24 @@ export function loadAgentConfig(): AgentConfig {
     apiKey: process.env.PICOGENT_API_KEY || process.env.ANTHROPIC_API_KEY || (file.api_key as string) || '',
     heartbeatIntervalSec: (file.heartbeat_interval_sec as number) || 30,
     allowedPaths: (file.allowed_paths as string[]) || [],
-    sessionId: (file.session_id as string) || '',
+    sessionId: ensureSessionId(file, configPath),
-    _configPath: configPath,
-    _configData: file,
   };
 }
+
+/**
+ * Ensure agent.json has a persistent session_id.
+ * Generated on first load, persisted to config file.
+ */
+function ensureSessionId(file: Record<string, unknown>, configPath: string | null): string {
+  if (file.session_id && typeof file.session_id === 'string') {
+    return file.session_id;
+  }
+  const id = crypto.randomUUID();
+  if (configPath) {
+    try {
+      file.session_id = id;
+      fs.writeFileSync(configPath, JSON.stringify(file, null, 2) + '\n');
+    } catch { /* non-fatal */ }
+  }
+  return id;
+}

src/router.ts

@@ -4,7 +4,7 @@ import { runAgent } from './agent.js';
 import { TrackerClient } from './tracker/client.js';
 import { createTrackerTools } from './tools/index.js';
 import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
-import { ensureSessionId, type AgentConfig } from './config.js';
+import type { AgentConfig } from './config.js';
 import type { TrackerEvent, TrackerTask } from './tracker/types.js';
 
 export interface TaskTracker {
@@ -86,7 +86,7 @@ export class EventRouter {
       let collectedText = '';
       for await (const msg of runAgent(prompt, {
         workDir: this.config.workDir,
-        sessionId: ensureSessionId(this.config),
+        sessionId: this.config.sessionId,
         model: this.config.model,
         provider: this.config.provider,
         systemPrompt: this.config.prompt || undefined,
@@ -158,7 +158,7 @@ export class EventRouter {
     let collectedText = '';
     for await (const msg of runAgent(content, {
       workDir: this.config.workDir,
-      sessionId: ensureSessionId(this.config),
+      sessionId: this.config.sessionId,
       model: this.config.model,
       provider: this.config.provider,
       systemPrompt: this.config.prompt || undefined,