chore: Project cleanup and Canvas UX improvements (Phase 7-9)

## Cleanup (v0.5.0)
- Delete 102+ orphaned MCP session temp files
- Remove build artifacts (htmlcov, dist, __pycache__)
- Archive superseded plan docs (RALPH_LOOP V2/V3, CANVAS V3, etc.)
- Move debug/analysis scripts from tests/ to tools/analysis/
- Archive redundant NX journals to archive/nx_journals/
- Archive monolithic PROTOCOL.md to docs/archive/
- Update .gitignore with missing patterns
- Clean old study files (optimization_log_old.txt, run_optimization_old.py)

## Canvas UX (Phases 7-9)
- Phase 7: Resizable panels with localStorage persistence
  - Left sidebar: 200-400px, Right panel: 280-600px
  - New useResizablePanel hook and ResizeHandle component
- Phase 8: Enable all palette items
  - All 8 node types now draggable
  - Singleton logic for model/solver/algorithm/surrogate
- Phase 9: Solver configuration
  - Add SolverEngine type (nxnastran, mscnastran, python, etc.)
  - Add NastranSolutionType (SOL101-SOL200)
  - Engine/solution dropdowns in config panel
  - Python script path support

## Documentation
- Update CHANGELOG.md with recent versions
- Update docs/00_INDEX.md
- Create examples/README.md
- Add docs/plans/CANVAS_UX_IMPROVEMENTS.md

CHANGELOG.md

@@ -6,6 +6,64 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+## [0.5.0] - 2025-01-24
+
+### Project Cleanup & Organization
+- Deleted 102+ orphaned MCP session temp files
+- Removed build artifacts (htmlcov, dist, __pycache__)
+- Archived superseded plan documents (RALPH_LOOP V2/V3, CANVAS V3, etc.)
+- Moved debug/analysis scripts from tests/ to tools/analysis/
+- Updated .gitignore with missing patterns
+- Cleaned empty directories
+
+## [0.4.0] - 2025-01-22
+
+### Canvas UX Improvements (Phases 7-9)
+- **Resizable Panels**: Left sidebar (200-400px) and right panel (280-600px) with localStorage persistence
+- **All Palette Items Enabled**: All 8 node types now draggable (model, solver, designVar, extractor, objective, constraint, algorithm, surrogate)
+- **Solver Configuration**: Engine selection (NX Nastran, MSC Nastran, Python Script) with solution type dropdowns (SOL101-SOL200)
+
+### AtomizerSpec v2.0
+- Unified JSON configuration schema for all studies
+- Added SolverEngine and NastranSolutionType types
+- Canvas position persistence for all nodes
+- Migration support from legacy optimization_config.json
+
+## [0.3.0] - 2025-01-18
+
+### Dashboard V3.1 - Canvas Builder
+- Visual workflow builder with 9 node types
+- Spec ↔ ReactFlow bidirectional converter
+- WebSocket real-time synchronization
+- Claude chat integration
+- Custom extractors with in-canvas code editor
+- Model introspection panel
+
+### Learning Atomizer Core (LAC)
+- Persistent memory system for accumulated knowledge
+- Session insights recording (failures, workarounds, patterns)
+- Optimization outcome tracking
+
+## [0.2.5] - 2025-01-16
+
+### GNN Surrogate for Zernike Optimization
+- PolarMirrorGraph with fixed 3000-node polar grid
+- ZernikeGNN model with design-conditioned convolutions
+- Differentiable GPU-accelerated Zernike fitting
+- Training pipeline with multi-task loss
+
+### DevLoop Automation
+- Closed-loop development system with AI agents
+- Gemini planning, Claude implementation
+- Playwright browser testing for dashboard UI
+
+## [0.2.1] - 2025-01-07
+
+### Optimization Engine v2.0 Restructure
+- Reorganized into modular subpackages (core/, nx/, study/, config/)
+- SpecManager for AtomizerSpec handling
+- Deprecation warnings for old import paths
+
 ### Phase 3.3 - Dashboard & Multi-Solution Support (November 23, 2025)
 
 #### Added