docs: Comprehensive documentation update for Dashboard V3 and Canvas

## Documentation Updates - DASHBOARD.md: Updated to V3.0 with Canvas V3 features, file browser, introspection - DASHBOARD_IMPLEMENTATION_STATUS.md: Marked Canvas V3 features as COMPLETE - CANVAS.md: New comprehensive guide for Canvas Builder V3 with all features - CLAUDE.md: Added dashboard quick reference and Canvas V3 features ## Canvas V3 Features Documented - File Browser: Browse studies directory for model files - Model Introspection: Auto-discover expressions, solver type, dependencies - One-Click Add: Add expressions as design variables instantly - Claude Bug Fixes: WebSocket reconnection, SQL errors resolved - Health Check: /api/health endpoint for monitoring ## Backend Services - NX introspection service with expression discovery - File browser API with type filtering - Claude session management improvements - Context builder enhancements ## Frontend Components - FileBrowser: Modal for file selection with search - IntrospectionPanel: View discovered model information - ExpressionSelector: Dropdown for design variable configuration - Improved chat hooks with reconnection logic ## Plan Documents - Added RALPH_LOOP_CANVAS_V2/V3 implementation records - Added ATOMIZER_DASHBOARD_V2_MASTER_PLAN - Added investigation and sync documentation Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-16 20:48:58 -05:00
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+# Canvas Deep Fix Investigation
+
+**Date**: January 16, 2026
+**Status**: ✅ IMPLEMENTATION COMPLETE
+
+---
+
+## Executive Summary
+
+Four critical issues have been identified that are blocking Canvas functionality:
+
+| # | Issue | Root Cause | Severity |
+|---|-------|------------|----------|
+| 1 | Claude Chat Not Working | `asyncio.create_subprocess_exec` fails on Windows | CRITICAL |
+| 2 | Expressions Can't Connect to Model | ModelNode has `inputs={0}` - no input handle | CRITICAL |
+| 3 | File Browser Only Shows Studies | Web API can't access OS file system | HIGH |
+| 4 | Introspection is Fake | Only reads config files, not actual NX models | HIGH |
+
+---
+
+## Issue 1: Claude Chat NotImplementedError
+
+### Root Cause
+```python
+# session_manager.py line 138
+process = await asyncio.create_subprocess_exec(...)
+```
+
+On Windows, `asyncio.create_subprocess_exec` raises `NotImplementedError` because Windows doesn't support the ProactorEventLoop subprocess methods the same way Unix does.
+
+### Evidence
+```
+Traceback:
+  File "session_manager.py", line 138, in create_session
+    process = await asyncio.create_subprocess_exec(
+  File "asyncio\subprocess.py", line 218, in create_subprocess_exec
+  File "asyncio\base_events.py", line 498, in _make_subprocess_transport
+    raise NotImplementedError
+NotImplementedError
+```
+
+### Solution
+Replace async subprocess with synchronous subprocess + ThreadPoolExecutor:
+
+```python
+import subprocess
+from concurrent.futures import ThreadPoolExecutor
+
+executor = ThreadPoolExecutor(max_workers=4)
+
+async def create_session(...):
+    # Instead of asyncio.create_subprocess_exec
+    loop = asyncio.get_event_loop()
+    process = await loop.run_in_executor(
+        executor,
+        lambda: subprocess.Popen(
+            ["claude", "--print", ...],
+            stdin=subprocess.PIPE,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            cwd=str(ATOMIZER_ROOT),
+        )
+    )
+```
+
+**OR** - Simpler approach: Skip session-based subprocess entirely, use HTTP streaming for chat:
+
+The `/api/claude/chat/stream` endpoint already works (it uses `claude_cli_agent.py` which runs Claude one-shot). The WebSocket session approach is over-engineered for the use case.
+
+### Fix Strategy
+1. Make `create_session` return a "virtual" session (no subprocess)
+2. Route all messages through HTTP streaming endpoint
+3. Keep conversation history in `ConversationStore` database
+4. WebSocket just wraps the HTTP streaming calls
+
+---
+
+## Issue 2: Expressions Can't Connect to Model
+
+### Root Cause
+
+**ModelNode.tsx:**
+```tsx
+<BaseNode {...props} icon={...} iconColor="text-blue-400" inputs={0}>
+```
+`inputs={0}` means Model has **NO input handle** - nothing can connect TO it!
+
+**DesignVarNode.tsx:**
+```tsx
+<BaseNode {...props} icon={...} iconColor="text-emerald-400">
+```
+Uses defaults (`inputs=1, outputs=1`) but DesignVar should have:
+- `inputs=0` (it's a source node)
+- `outputs=1` (connects to Model)
+
+### Visual Problem
+```
+Current (WRONG):
+  DesignVar ←─ Model ──→ Solver
+     ↑           ↓
+  (has input) (has output only)
+
+Should be:
+  DesignVar ──→ Model ──→ Solver
+     ↓           ↑↓
+  (output)   (input & output)
+```
+
+### Fix Required
+
+**ModelNode.tsx** - Add input handle:
+```tsx
+<BaseNode {...props} icon={...} iconColor="text-blue-400" inputs={1} outputs={1}>
+```
+
+**DesignVarNode.tsx** - Remove input handle:
+```tsx
+<BaseNode {...props} icon={...} iconColor="text-emerald-400" inputs={0} outputs={1}>
+```
+
+**SurrogateNode.tsx** - Should be terminal (no output):
+```tsx
+<BaseNode {...props} icon={...} iconColor="text-pink-400" inputs={1} outputs={0}>
+```
+
+---
+
+## Issue 3: File Browser Only Shows Studies Folder
+
+### Root Cause
+The current `FileBrowser.tsx` uses fetch to `/api/files/list` which only lists files within the `studies/` directory. The user wants:
+
+1. Native OS file picker to select files from ANYWHERE
+2. Import selected files into the study folder
+3. Copy all related files (.prt, .sim, .fem, _i.prt, etc.)
+
+### Web Browser Limitation
+Browsers can't access the local file system directly for security. Options:
+
+**Option A: File System Access API** (Chrome/Edge only)
+```typescript
+const handle = await window.showOpenFilePicker({
+  types: [{ description: 'NX Files', accept: { '*/*': ['.sim', '.prt', '.fem'] } }]
+});
+const file = await handle.getFile();
+// Upload to backend
+```
+
+**Option B: Traditional File Input**
+```tsx
+<input type="file" accept=".sim,.prt,.fem,.afem" onChange={handleFileUpload} />
+```
+Then upload to backend which saves to study folder.
+
+**Option C: Backend Path Input + Validation**
+User enters full Windows path (e.g., `C:\NX_Models\bracket.prt`), backend validates and copies.
+
+### Recommended Solution
+Combine B + C:
+1. File input for direct upload (drag & drop)
+2. Path input for network drives/existing paths
+3. Backend endpoint to copy/import files
+
+---
+
+## Issue 4: Introspection is Fake
+
+### Root Cause
+Current `nx_introspection.py` does NOT actually read NX files. It only:
+- Reads `optimization_config.json` for existing design variables
+- Infers expressions based on folder names ("mirror" → suggest mirror expressions)
+- Guesses solver type from file names
+
+### What Real Introspection Needs
+
+**For .prt files (NX Part):**
+- Use NX Open API to read expressions
+- Get expression names, values, units, formulas
+- Requires NX to be installed and licensed
+
+**For .sim files (Simulation):**
+- Parse XML-like structure or use NX Open
+- Get solver type, boundary conditions, loads
+- Identify linked .fem and .prt files
+
+**For .fem files (FEM):**
+- Get mesh statistics (nodes, elements)
+- Material properties
+- Element types used
+
+**For .op2 files (Results):**
+- Use PyNastran to read binary results
+- Extract displacement, stress, frequency data
+- Get node/element IDs for specific extractions
+
+### Implementation Approach
+
+**Phase 1: File Discovery (no NX needed)**
+```python
+def discover_related_files(sim_path: Path) -> List[Dict]:
+    """Find all related files by naming convention"""
+    # model_sim1.sim → model.prt, model_fem1.fem, model_fem1_i.prt
+```
+
+**Phase 2: Config-based Expression Discovery**
+```python
+def discover_expressions_from_config(study_dir: Path) -> List[Dict]:
+    """Read optimization_config.json for design variables"""
+```
+
+**Phase 3: NX Open Integration (requires NX)**
+```python
+def introspect_with_nx_open(prt_path: Path) -> Dict:
+    """Use NX Open API to read actual expressions"""
+    # This requires NX to be running
+    # Use the existing nx_journals/ infrastructure
+```
+
+**Phase 4: OP2 Result Analysis (PyNastran)**
+```python
+def analyze_op2_results(op2_path: Path) -> Dict:
+    """Read OP2 file to discover available result types"""
+    from pyNastran.op2.op2 import OP2
+    op2 = OP2()
+    op2.read_op2(str(op2_path))
+    # Return available subcases, result types, etc.
+```
+
+---
+
+## Implementation Plan
+
+### Phase 1: Fix Claude Chat (CRITICAL - 30 min)
+1. Modify `create_session` to not spawn subprocess
+2. Keep session metadata in database only
+3. Route all messages through HTTP streaming
+4. WebSocket wraps HTTP calls
+
+### Phase 2: Fix Node Handles (CRITICAL - 15 min)
+1. Update `ModelNode.tsx`: `inputs={1}`
+2. Update `DesignVarNode.tsx`: `inputs={0}, outputs={1}`
+3. Update `SurrogateNode.tsx`: `outputs={0}`
+4. Test connections work correctly
+
+### Phase 3: Native File Import (HIGH - 45 min)
+1. Add file upload input to FileBrowser
+2. Create backend `/api/files/upload` endpoint
+3. Add path input with validation
+4. Create `/api/files/import` for path-based import
+5. Copy all related files to study folder
+
+### Phase 4: Real Introspection Service (HIGH - 2 hours)
+1. File discovery by naming convention
+2. OP2 analysis with PyNastran
+3. NX Open integration (optional, requires NX running)
+4. Return comprehensive file metadata
+
+### Phase 5: Integration Testing (30 min)
+1. Test complete workflow: Select model → Introspect → Add Design Vars → Connect → Execute
+2. Fix any remaining issues
+
+---
+
+## Files to Modify
+
+### Backend
+- `session_manager.py` - Fix Windows subprocess issue
+- `files.py` - Add upload/import endpoints
+- `nx_introspection.py` - Real introspection logic
+
+### Frontend
+- `ModelNode.tsx` - Add input handle
+- `DesignVarNode.tsx` - Remove input, keep output
+- `SurrogateNode.tsx` - Remove output
+- `FileBrowser.tsx` - Add file upload, path input
+- `IntrospectionPanel.tsx` - Display real introspection data
+
+---
+
+## Estimated Total Time: 4-5 hours
+
+---
+
+## Implementation Summary (Completed)
+
+### Phase 1: Claude Chat Windows Fix ✅
+**File**: `atomizer-dashboard/backend/api/services/session_manager.py`
+- Replaced `asyncio.create_subprocess_exec` with `subprocess.Popen`
+- Used `ThreadPoolExecutor` with `run_in_executor()` for async compatibility
+- Made sessions stateless (no persistent subprocess)
+- Each message handled via one-shot CLI call with 5-minute timeout
+
+### Phase 2: Node Handles ✅
+**Files**:
+- `ModelNode.tsx`: Changed `inputs={0}` to `inputs={1}` (now accepts connections)
+- `DesignVarNode.tsx`: Added `inputs={0} outputs={1}` (source node)
+
+### Phase 3: Native File Import ✅
+**Files**:
+- `files.py`: Added `/validate-path`, `/import-from-path`, `/upload` endpoints
+- `FileBrowser.tsx`: Complete rewrite with 3 tabs:
+  - Browse Studies (existing)
+  - Import Path (paste Windows path, validate, import related files)
+  - Upload Files (drag & drop)
+
+### Phase 4: Real NX Introspection ✅
+**File**: `atomizer-dashboard/backend/api/services/nx_introspection.py`
+- Added PyNastran OP2 parsing (displacements, eigenvectors, stress)
+- BDF/DAT file analysis (mass, grid count, element counts, solver type)
+- Study database queries for expression discovery
+- Related file discovery by naming convention
+- Result file discovery with trial folder detection