instanced Vorkath encounter no ds2 requirements

[bigtorka]

Summary

• add a complete solo Vorkath instance with wake, combat, death, reset, escape, logout, and cleanup lifecycles
• implement standard attack weighting, dragonfire protection values, fireball, acid barrage, zombified spawn pathing, Crumble Undead, and phase-specific damage rules
• add persistent Torfinn death storage and atomic 100,000-coin reclamation, including replacement and unsafe-death cleanup
• expose reusable instance local-coordinate resolution and typed numeric area sounds required by cache-accurate encounter content

OpenRune does not currently expose complete Dragon Slayer II quest state, so access is isolated behind VorkathAccessPolicy and remains enabled by default.

Verification

• .\gradlew.bat :content:bosses:vorkath:test :content:skills:magic:spell-attacks:test --no-daemon --quiet
• .\gradlew.bat spotlessCheck --no-daemon --quiet
• 108 focused tests passed with zero failures
• donor/private runtime hooks and admin/debug commands are not included

The full build reached :server:app:shadowJar; packaging could not replace an existing locked server.jar. Compilation, focused tests, formatting, and staged-diff validation passed.