feat: Add WSL support for Cursor CLI on Windows

- Add reusable WSL utilities in @automaker/platform (wsl.ts):
  - isWslAvailable() - Check if WSL is available on Windows
  - findCliInWsl() - Find CLI tools in WSL, tries multiple distributions
  - execInWsl() - Execute commands in WSL
  - createWslCommand() - Create spawn-compatible command/args for WSL
  - windowsToWslPath/wslToWindowsPath - Path conversion utilities
  - getWslDistributions() - List available WSL distributions

- Update CursorProvider to use WSL on Windows:
  - Detect cursor-agent in WSL distributions (prioritizes Ubuntu)
  - Use full path to wsl.exe for spawn() compatibility
  - Pass --cd flag for working directory inside WSL
  - Store and use WSL distribution for all commands
  - Show "(WSL:Ubuntu) /path" in installation status

- Add 'wsl' to InstallationStatus.method type

- Fix bugs:
  - Fix ternary in settings-view.tsx that always returned 'claude'
  - Fix findIndex -1 handling in WSL command construction
  - Remove 'gpt-5.2' from unknown models test (now valid Cursor model)

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

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

libs/platform/src/index.ts

@@ -55,3 +55,18 @@ export {
   type NodeFinderResult,
   type NodeFinderOptions,
 } from './node-finder.js';
+
+// WSL (Windows Subsystem for Linux) utilities
+export {
+  isWslAvailable,
+  clearWslCache,
+  getDefaultWslDistribution,
+  getWslDistributions,
+  findCliInWsl,
+  execInWsl,
+  createWslCommand,
+  windowsToWslPath,
+  wslToWindowsPath,
+  type WslCliResult,
+  type WslOptions,
+} from './wsl.js';