v1.2.0

Fix critical issues from code review

Fixes #1: Thread safety - read Tkinter vars in main thread
- All StringVar reads now happen in run_optimizer() before spawning worker
- Worker receives parameters as dict argument (thread-safe)

Fixes #2: Add cancellation support to pattern generation
- generate_patterns() now accepts optional stop_event parameter
- Checks for cancellation every 5000 iterations in 2-pipe loop
- Checks for cancellation every 10000 iterations in 3-pipe loop
- Returns partial patterns on cancellation for graceful exit

Fixes #3: Kill CBC subprocess on cancel
- Added _kill_solver_processes() to terminate orphan CBC processes
- Called on cancel button click and window close
- Uses psutil to find and terminate CBC processes

Fixes #4: Add Windows paths to fix_cbc_permissions
- Added win/64 and win/32 paths for CBC solver
- Added documentation about Windows chmod behavior

Issue #5 (memory optimization) deferred - current implementation adequate

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

v1.1.1

Add max welds dropdown to GUI

- Add dropdown to limit max welds per pile (1, 2, or 3)
- Default remains 3 for backward compatibility
- Fewer welds = faster pattern generation
- Show max welds in results summary

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

v1.1.0

Add advanced parameters to GUI for v1.1.0

- Add configurable time limit, precision, optimality gap, and thread count
- Make solver threads proportional to CPU cores (50% with safety margin)
- Add inline descriptions for all parameters
- Show parameters used in results summary
- Update README with new features documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

v1.0.0

Fix: Add write permissions for GitHub releases