Spike findings before RR3 (BuildingLoader impl). Documents:
- DatReaderWriter.Types.BuildingInfo field shape (verbatim ilspy decomp
of DRW 2.1.7 — type is BuildingInfo with field BuildingPortal, not the
plan's tentative BldPortal; same OtherCellId semantics)
- WB PortalService.GetPortalsByBuilding interior-portal walk algorithm
(BFS through EnvCell.CellPortals; 0xFFFF == exit-portal sentinel)
- Holtburg town landblock 0xA9B4FFFF live BuildingInfo dump: 12 buildings,
1-10 portals each, including the cottage from the #98 cellar saga at
idx=6 (cells 0xA9B40145/014C/014E/014F/0150)
- Resolved BuildingLoader algorithm + 2 minor rename corrections vs the
plan's RR3 pseudocode (BuildingPortal not BldPortal; defensive 0xFFFF
skip kept matching WB)
- 6 edge cases (empty portals, shared cells, unloaded interiors, etc.)
Gate decision: data shape compatible — proceed to RR3.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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