Define the first upstream sync review for this fork

[Lkkisme]

This issue tracks the first explicit upstream sync review for Lkkisme/Cap.

Relationship policy: https://github.com/Lkkisme/Cap/blob/main/docs/upstream-relationship.md
Roadmap: https://github.com/Lkkisme/Cap/blob/main/docs/ROADMAP.md

Checklist:

• Compare this fork with the current upstream CapSoftware/Cap main branch.
• Identify upstream fixes relevant to Windows desktop packaging or release trust.
• Identify fork-specific changes that should remain downstream.
• Identify generic fixes that should be proposed upstream first.
• Document the sync decision in a PR, release note, or maintenance log.