### Fixed
- Replaced unreliable taskkill /T with PowerShell Get-CimInstance for child process detection in WindowsProcess.ts
- Fixed orphaned node.exe processes when Obsidian closes by killing child processes before parent
- Added proper cleanup when shell: true creates cmd.exe -> node.exe process tree
### Added
- Static currentProcess field to track active process for cleanup during window close
- Static cleanupHandlerRegistered flag to prevent duplicate event handlers
- beforeunload event handler for synchronous cleanup when Obsidian window closes
- killProcessSync method for immediate process termination without async delays
- registerCleanupHandler method to set up window close event listener
### Changed
- Updated start method to store process reference and register cleanup handler
- Modified stop method to use PowerShell child lookup before killing parent process
- Enhanced error handling with try/catch blocks for PowerShell and taskkill operations
- Add shell: true to spawn options for .cmd file execution on Windows
- Add windowsHide: true to prevent console window from appearing
- Remove detached: true which conflicts with shell: true on Windows
Fixes spawn EINVAL error on Windows when launching opencode.cmd
Set NODE_USE_SYSTEM_CA=1 when spawning the opencode server process.
This allows Bun to use the macOS system keychain for TLS validation,
fixing SSL errors for users on corporate VPNs with custom CAs.
