docs: create Phase 2 work log

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phase2_worklog.md

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+# Phase 2: Canvas Manager Factory Pattern - Work Log
+
+## Overview
+Implementing Phase 2 of the Canvas Multi-Instance Implementation Plan:
+- Section 2.0: Configure Listener Middleware in the store
+- Section 2.1: Replace singleton $canvasManager with registry Map
+- Section 2.2: Update/Create Canvas Manager Factory with lifecycle management
+- Section 2.3: Update Canvas Manager to work with the new architecture
+
+## Progress Log
+
+### Started: 2025-09-02
+
+#### Initial Assessment
+- [ ] Examine current store configuration
+- [ ] Review existing CanvasManager implementation
+- [ ] Check current singleton pattern usage
+
+#### Section 2.0: Configure Listener Middleware
+- [ ] Add listener middleware to store
+- [ ] Configure listeners for canvas instance management
+
+#### Section 2.1: Replace Singleton with Registry
+- [ ] Replace $canvasManager singleton with Map-based registry
+- [ ] Update all imports and references
+
+#### Section 2.2: Canvas Manager Factory
+- [ ] Create/Update factory pattern for canvas managers
+- [ ] Implement lifecycle management (creation, cleanup)
+
+#### Section 2.3: Update Canvas Manager Architecture
+- [ ] Update CanvasManager to work with new architecture
+- [ ] Ensure proper instance isolation
+
+## Notes
+- Working directory: /home/bat/git/InvokeAI/invokeai/frontend/web
+- Current branch: psyche/feat/ui/multi-instance-canvas
+- Phase 1 completed: canvasInstanceSlice and canvasesSlice are in place