docs(spec): update spec page to reflect current reality
- Sidebar: all 13 steps listed in order (00-12), arch updated
- Step 03: add Edge new tab page policy rows (quick links, background, content)
- Step 04: taskbar pin row updated — explicit Explorer+Edge pins, PinListPlacement=Replace
- Step 05: add Wallpaper="" fix row (black desktop for new users)
- Steps 09/10/11: correct IDs (step-09/10/11), moved out of "Planovane" section
- Step 12: new Windows Update card with PSWindowsUpdate details
- Arch: xetup.exe rewritten — Walk GUI (Win32), no OpenGL, VMware-safe, step strip, auto-reboot
- Version bump: 0.3-draft -> 0.4
- JS STEP_SCRIPT: updated IDs to match new step anchor names
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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