Syrinx 0.2.0 preview

Weekly preview of Syrinx for Windows 11 (x64), built from 6dac3e12bd50 on main.

This is an early, unsigned preview. Windows SmartScreen may warn before it runs.
Check the zip against SHA256SUMS.txt before installing, then follow the
installation guide.

What changed

• Format the panic notice so the gate's rustfmt step passes
• Merge P1-39c: an owner-pressed "Check for updates" over WinHTTP
• Merge P1-39b: stage verified updates and swap them in with rollback
• Merge DW-64 and DW-65: the native fixture fails fast and cleans up after a pass
• Merge P1-39a: the signed latest-version statement and release signing
• Merge the fixture-timeout diagnosis: the old suspension timer froze two hidden test pages
• Merge origin/main: release workflow fixes from PR #2
• Merge DW-7: forget a remembered site permission from settings
• Merge DW-61: one Tab stop and arrow keys in the sidebar tree

Full list of changes