fix: support offline encryption and silent token renewal

[milutinke]

What changed?

Fixes encrypted offline logins and Microsoft token renewal during certificate refresh. Bumps UMPK to 0.9.0-beta.6 and moves ASD-STE100 to MCC-Skills. Clone examples use --recurse-submodules. Piston tests now wait for tick completion and received movement packets.

Versions affected

Offline encryption: Minecraft 1.20.5+ (766+). Legacy authentication regressions cover 47, 759, 760 and 765. Token renewal is protocol-independent.

Evidence

Reproduced the original error on Paper 26.2 with OfflineEncryptor. The added regressions fail before the fixes.

Validation

• 41 new regression cases pass, including delayed piston ticks; full suite: 12,620 passed, 7 existing skips; count gate passed.
• Release build, formatting and dataset/language checks passed; 60 regenerated files match.
• 14 packages and 13 symbol packages verified.
• All seven CI jobs pass, including Windows, Linux and macOS builds/tests and the AOT smoke test.

The migration also passed skill validation, linter self-tests, installer discovery, content checks and all eight shared-skill links.

Notes for reviewers

Adds IsAuthenticated to login/session results. Live tests covered plain/encrypted offline Paper and online Paper with a local Yggdrasil provider. Real Microsoft/Mojang login remains untested.