Fix dangling Lua enum helper calls - #1293

Summary

• use WC3's native enum accessors while Lua context collectors are executing inside native callbacks
• avoid dangling references to separately garbage-collected __wurst_GetEnum* helpers
• cover force, group, item, and destructable collector output

Acceptance criteria

• ForForce works when user code does not otherwise reference GetEnumPlayer
• generated context collectors contain no hidden dependency on separately emitted helper functions
• override-aware helpers remain available for replayed callbacks that call GetEnum*

Checks

• focused Lua callback-helper regression set: passed
• LuaTranslationTests: passed
• full test suite: passed (completed before the request to leave the full suite to CI)
• git diff --check: passed

Known gaps

• no Warcraft III client run; generated Lua and Lua runtime tests cover this compiler-emission defect