The new value type collided with DatReaderWriter.Types.Frame (used in
physics-adjacent code like ShadowShapeBuilder), which the structural fix
(per-file using-aliases across 6 files) would have re-incurred in every
later physics slice. Renamed the TYPE to CellFrame; the Position.Frame
MEMBER keeps retail's name. Restored the 5 alias-only files to their
pre-Slice-1 state; synced spec + plan. Core 1522 passed / 0 failed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Introduces the two value types (Frame, Position) that represent retail's
cell-relative position pair (acclient.h:30647/30658). Types are unused
by consumers yet — zero behavior change. Also ports LandDefs::get_block_offset
(pc:69189, @0x0043e630): world-meter offset between two named landblock ids,
the ONLY cross-cell translation primitive in retail physics. Conformance tests:
same-landblock→Zero, south-neighbour→(0,-192,0) (the exact #145 cascade cell),
east-neighbour→(+192,0,0), diagonal→(+192,+192,0). 4/4 pass; full Core suite
1522 passed / 0 failed. DatFrame alias added to 4 files that had using
DatReaderWriter.Types + using AcDream.Core.Physics in scope simultaneously.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
