fix: Address critical Windows compatibility and JLCPCB issues (#36, #37, #35)

Phase 1 critical fixes addressing three high-priority issues:

Issue #36 - Windows IPC backend crash (os.getuid not available):
- Add platform detection to skip Unix-specific socket paths on Windows
- Use hasattr check before calling os.getuid()
- Windows now uses auto-detect fallback (named pipes)
- Maintains full Unix socket support on Linux/macOS

Issue #37 - Windows schematic file creation broken:
- Generate unique UUIDs instead of invalid all-zeros UUID
- Add explicit UTF-8 encoding for cross-platform compatibility
- Force Unix line endings (LF) to prevent Windows CRLF issues
- Update template file with valid placeholder UUID
- Fix hardcoded /tmp/ paths in wire_manager.py and pin_locator.py

Issue #35 - JLCPCB download limited to 100 parts:
- Change batch_size from 1000 to 100 to match tscircuit API limit
- Remove premature loop termination when batch < batch_size
- Add documentation explaining API limitation
- Expected result: Full ~2.5M part catalog download (40-60 minutes)

All changes maintain backward compatibility and include detailed comments.

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

python/commands/jlcsearch.py

@@ -143,14 +143,17 @@ class JLCSearchClient:
     def download_all_components(
         self,
         callback: Optional[Callable[[int, str], None]] = None,
-        batch_size: int = 1000
+        batch_size: int = 100
     ) -> List[Dict]:
         """
         Download all components from jlcsearch database
 
+        Note: tscircuit API has a hard-coded 100 result limit per request.
+        Full catalog download requires ~25,000 paginated requests (~40-60 minutes).
+
         Args:
             callback: Optional progress callback function(parts_count, status_msg)
-            batch_size: Number of parts per batch
+            batch_size: Number of parts per batch (max 100 due to API limit)
 
         Returns:
             List of all parts
@@ -168,7 +171,8 @@ class JLCSearchClient:
                     offset=offset
                 )
 
-                if not batch:
+                # Stop if no results returned (end of catalog)
+                if not batch or len(batch) == 0:
                     break
 
                 all_parts.extend(batch)
@@ -179,9 +183,8 @@ class JLCSearchClient:
                 else:
                     logger.info(f"Downloaded {len(all_parts)} parts so far...")
 
-                # If we got fewer results than requested, we've reached the end
+                # Continue pagination - API returns exactly 100 results per page until exhausted
-                if len(batch) < batch_size:
+                # Only stop when we get 0 results (handled above)
-                    break
 
                 # Rate limiting - be nice to the API
                 time.sleep(0.1)

python/commands/pin_locator.py

@@ -7,6 +7,7 @@ Uses S-expression parsing to extract pin data from symbol definitions.
 
 import logging
 import math
+import tempfile
 from pathlib import Path
 from typing import List, Tuple, Optional, Dict
 import sexpdata
@@ -314,8 +315,8 @@ if __name__ == '__main__':
     print("PIN LOCATOR TEST")
     print("=" * 80)
 
-    # Create test schematic with components
+    # Create test schematic with components (cross-platform temp directory)
-    test_path = Path('/tmp/test_pin_locator.kicad_sch')
+    test_path = Path(tempfile.gettempdir()) / 'test_pin_locator.kicad_sch'
     template_path = Path('/home/chris/MCP/KiCAD-MCP-Server/python/templates/template_with_symbols_expanded.kicad_sch')
 
     shutil.copy(template_path, test_path)

python/commands/schematic.py

@@ -2,6 +2,7 @@ from skip import Schematic
 import os
 import shutil
 import logging
+import uuid
 
 logger = logging.getLogger('kicad_interface')
 
@@ -28,9 +29,12 @@ class SchematicManager:
             else:
                 # Fallback: create minimal schematic
                 logger.warning(f"Template not found at {template_path}, creating minimal schematic")
-                with open(output_path, 'w') as f:
+                # Generate unique UUID for this schematic
+                schematic_uuid = str(uuid.uuid4())
+                # Write with explicit UTF-8 encoding and Unix line endings for cross-platform compatibility
+                with open(output_path, 'w', encoding='utf-8', newline='\n') as f:
                     f.write('(kicad_sch (version 20230121) (generator "KiCAD-MCP-Server")\n\n')
-                    f.write('  (uuid 00000000-0000-0000-0000-000000000000)\n\n')
+                    f.write(f'  (uuid {schematic_uuid})\n\n')
                     f.write('  (paper "A4")\n\n')
                     f.write('  (lib_symbols\n  )\n\n')
                     f.write('  (sheet_instances\n    (path "/" (page "1"))\n  )\n')

python/commands/wire_manager.py

@@ -9,6 +9,7 @@ manipulate the .kicad_sch file directly.
 import uuid
 import logging
 import math
+import tempfile
 from pathlib import Path
 from typing import List, Tuple, Optional, Dict
 import sexpdata
@@ -382,8 +383,8 @@ if __name__ == '__main__':
     print("WIRE MANAGER TEST")
     print("=" * 80)
 
-    # Create test schematic
+    # Create test schematic (cross-platform temp directory)
-    test_path = Path('/tmp/test_wire_manager.kicad_sch')
+    test_path = Path(tempfile.gettempdir()) / 'test_wire_manager.kicad_sch'
     template_path = Path('/home/chris/MCP/KiCAD-MCP-Server/python/templates/empty.kicad_sch')
 
     shutil.copy(template_path, test_path)

python/kicad_api/ipc_backend.py

@@ -15,6 +15,7 @@ Key Benefits over SWIG:
 """
 import logging
 import os
+import platform
 from pathlib import Path
 from typing import Optional, Dict, Any, List, Callable
 
@@ -74,12 +75,16 @@ class IPCBackend(KiCADBackend):
             if socket_path:
                 socket_paths_to_try.append(socket_path)
             else:
-                # Common socket locations
+                # Common socket locations (Unix-like systems only)
-                socket_paths_to_try = [
+                # Windows uses named pipes, handled by auto-detect
-                    'ipc:///tmp/kicad/api.sock',  # Linux default
+                if platform.system() != "Windows":
-                    f'ipc:///run/user/{os.getuid()}/kicad/api.sock',  # XDG runtime
+                    socket_paths_to_try.append('ipc:///tmp/kicad/api.sock')  # Linux default
-                    None  # Let kipy auto-detect
+                    # XDG runtime directory (requires getuid, Unix only)
-                ]
+                    if hasattr(os, 'getuid'):
+                        socket_paths_to_try.append(f'ipc:///run/user/{os.getuid()}/kicad/api.sock')
+
+                # Auto-detect for all platforms (Windows uses named pipes, Unix uses sockets)
+                socket_paths_to_try.append(None)
 
             last_error = None
             for path in socket_paths_to_try:

python/templates/template_with_symbols.kicad_sch

@@ -1,6 +1,6 @@
 (kicad_sch (version 20230121) (generator "KiCAD-MCP-Server")
 
-  (uuid 00000000-0000-0000-0000-000000000000)
+  (uuid a1b2c3d4-e5f6-4a5b-8c9d-0e1f2a3b4c5d)
 
   (paper "A4")