New builtins: CompareStr, CompareText (→ _StringCompare/_StringCompareText),
ZeroMem (→ memset), _ClassAddRef/_ClassRelease for manual ARC management.
EmitPointerWrite now emits retain/release when the base type is tyString,
enabling ARC-correct string storage in ^string arrays. ZeroMem is used to
zero-initialise newly grown string slots so the "release old" half of ARC
never sees uninitialised memory.
Classes.pas: TObjectList (^Pointer array, no ARC overhead) and TStringList
(^string + ^Pointer parallel arrays, sorted binary search via CompareText,
complete Delete/Insert/Clear with correct ARC). Generics.Collections and
phase3_milestone updated to zero-init new array slots, fixing previously
hidden memory safety issues revealed by the EmitPointerWrite ARC fix.
785 tests pass, zero Valgrind errors.
6688f32926