Document session persistence bug fix

Update PROMPT.md and scratchpad with complete documentation of the
bug fix for session persistence after page refresh.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.agent/scratchpad.md

@@ -28,12 +28,44 @@ This ensures sessions always come from the authoritative source (the backend API
 
 ## Implementation
 
-Remove the `await this.initialize()` call from `createSessionInFolder()` after `loadProjects()`. The `loadProjects()` call already refreshes the data from the API, so we don't need to re-initialize.
+### Fix 1: Reset sessions in loadManuallyCreatedProjects()
+File: `project-manager.js` lines 52-87
+
+Modified `loadManuallyCreatedProjects()` to create a sanitized project object with:
+- `sessions: []` - Reset to empty array
+- `activeSessionId: null` - Reset active session
+
+This prevents stale localStorage session data from overriding fresh API data.
+
+### Fix 2: Remove redundant initialize() call
+File: `project-manager.js` lines 542-563
+
+Modified `createSessionInFolder()` to:
+- Remove `await this.initialize()` call
+- Add `this.renderProjectTabs()` to update UI
+- Make `switchProject()` call await properly
+
+This prevents reloading stale localStorage data after fetching fresh API data.
+
+## Commit
+Commit: c5dbb6c
+"Fix session persistence after page refresh"
 
 ## Testing Steps
 
+To verify the fix works:
+
 1. Create new project named 'test'
 2. Start new session in 'test' project
 3. Check that session appears in left sidebar
 4. Refresh page
-5. Verify session still appears in 'test' project
+5. Verify session still appears in 'test' project's session list
+6. Verify session is correctly displayed in left sidebar
+
+## Status
+**FIX IMPLEMENTED AND COMMITTED**
+
+The fix ensures:
+1. Session data always comes from the API (authoritative source)
+2. localStorage only stores project metadata (name, id, workingDir)
+3. No stale session data can override fresh API data