- DoS_tests: remove extra arg from VerifySignature calls (5 -> 4 params)
- accounting_tests: int64 -> int64_t for modern compilers
- CI: bump VERSION 5.3.5 -> 5.3.6
- Snap/Flatpak: fix asset URLs to match CI naming convention
- Add AppStream metainfo for store listings
- Add DNS2 seed node setup guide
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
