- WOB save/load now serializes Material struct fields (flags, shader,
blendMode, texturePath) per group — was saving only texture paths
- FORMAT_SPEC.md v1.1: documents WOT doodad/WMO placements, WOB
material fields, doodad rotation, terrain stamps, WCP file list
- Test coverage: 5 new assertions verify material round-trip (flags,
shader, blendMode all preserved through save→load cycle)
- 260 total assertions across 75 test cases, all passing