feat(simulation): 7 specialized morphology geometry generators (T-1029)
D-239 §5/§8/§9 — replace the AlluvialPlain-fallback stubs with real per-family
geometry on the VoxelColumn pipeline. All integer (D-010); warp is the only f64.
- LavaField: Lava shield slopes + tube depressions, immature drainage (no deep water).
- FjordWall: Rock glacial U-valley — Deep-water floor, moraine band (grade>=1),
near-vertical walls, cirques (grade>=2); floor half-width 4..8m (§9).
- CliffCoast: Rock vertical face at the water edge; plateau -> cliff -> splash -> ocean.
- BraidedDelta: Gravel, 3 braided threads (not single-thread), capped near sea level.
- DuneStrand: Sand, wind-aligned dunes at <=32deg angle of repose (integer ratio).
- IncisedGorge: Rock gorge, floor 2..8m wide (§9), near-vertical walls, single channel.
- MeanderReach: Soil single-thread meander (higher sinuosity than AlluvialPlain),
thalweg below / levees above the waterline (§9 ElevationDelta); Wetland sub-zone.
§8 laws honoured: drainage monotonicity (mouths at sea level), lithology->landform,
glaciation->form (FjordWall U not V; grade-0 gated upstream at classification).
New helpers: compute_meander_reach_channel, in_levee_band.
53 family tests incl real geometry assertions (gorge floor width in [2,8]m, fjord
walls > floor, braided multi-thread, dune Sand). cargo test 1595 pass, clippy
-D warnings clean, fmt clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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