types unit (System.Types core) — geometry records + TDuplicates

• Type: feature (library — RTL, Track B)
• Status: DONE 2026-07-04
• Owner: Track B

What / why

Real FPC/FCL units uses Types (FPC's System.Types). fgl needs TDuplicates; GUI/geometry code wants TPoint/TRect/TSize. pxx had no types unit, so those units hit uses: unit source not found: types.

Done

Added lib/rtl/types.pas (Zlib, matching the rest of lib/rtl) with the common System.Types core, minimal + extendable:

• TValueRelationship = -1..1 + LessThanValue/EqualsValue/GreaterThanValue.
• TDuplicates = (dupIgnore, dupAccept, dupError).
• TPoint/PPoint, TSmallPoint, TSize, TRect/PRect records.
• Constructors Point/SmallPoint/Size/Rect/Bounds + RectWidth/ RectHeight helpers.

Resolves via pxx's normal uses search (lib/rtl); libc-free. Verified with both the fresh and the pinned-stable compiler; fgl now gets past its uses types wall (advances to the class-methods-in-generic member gap, [[feature-class-methods-in-generic-class]]).

Extend later (as consumers need)

TRectF/TPointF float variants, TByteArray/TWordArray helpers, more Rect ops (Intersect/Union/Contains), TListSortComparer typedef. Left out until a consumer needs them.