Release ARSAS 1.6.28

[masarray]

Release scope

Publish ARSAS 1.6.28 from the validated current main after the UTC-Time engine precision fix and the latest workstation/FAT progress.

Included since v1.6.27

• restore first-run SCL, Add IED by IP, project and Excel IO-list launcher cards without removing the P2 workstation visual layer (Restore first-run SCL, IP and Excel launcher cards #162);
• restore immediate FAT TRUE/evidence priority without UI starvation (P0.1: restore immediate FAT evidence priority without UI starvation #163);
• advance the immutable ARIEC61850 engine to PR Self-host landing media and add safe Windows downloads #55 / commit 8b46cfed0614a4d0b0a5bf73fa7a6e77cf6fe817, preserving IEC 61850 24-bit fractional-second precision through decoding instead of truncating to milliseconds (Integrate ARIEC61850 UTC-Time precision fix #164);
• add a cross-repository regression proving wire fraction 0x33 0x5A 0x86 decodes to 31.2006000 and the existing ARSAS millisecond presentation rounds it to 31.201;
• restore fundamental MMXU/MMXN live power/frequency measurements, safe mag/instMag sibling handling and correct power units (Fix live MMXU power measurements #165);
• correct FAT hover terminology to Decoded IED timestamp (full precision) so ARSAS does not claim exact raw-wire provenance it does not yet store (Clarify FAT timestamp hover as decoded precision evidence #167).

Release metadata

• version: 1.6.28
• stable Windows x64
• publicationRequest: 16
• primary public asset remains ARSAS-Windows-x64-Setup.exe

Precision/evidence boundary

ARSAS 1.6.28 preserves the full decoded IEC 61850 timestamp at .NET 100 ns resolution. The three-digit FAT display still rounds to nearest millisecond. This release does not claim to retain the exact original 8-byte UTC-Time packet payload in FAT evidence.

Merge/publication gate

Merge only after the exact release head passes the standard ARSAS build/regression/portable smoke test, focused IO FAT and SV evidence validation, and Windows installer compile + silent install/uninstall smoke test. Immediately before merge, main must still equal the release branch base; otherwise rebuild the release branch on the newer main instead of merging stale metadata.