Perf/hier render fastpath#5
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…aycast Solid rendering traced every ray to t_max through the full model depth even after hitting the first visible material. Add a first-hit render path that stops at the first material segment past the clip entry, plus a nested-universe neighbor-walk (using a new persistent surface->cell map) that replaces the per-step root-to-leaf relocation. Both are gated to the render entry points; transport/x-ray output stays byte-identical to baseline.
Add alea_find_cells_grid_raycast(): a drop-in for alea_find_cells_grid() that traces one in-plane ray per image row and maps the resulting cell segments to column spans (O(cell-crossings/row) instead of one point query per pixel). Backed by a new buffer-reuse, neighbor-walk-off entry alea_raycast_hier_fast_segments_nocache() whose per-pixel cell matches the canonical point lookup. Includes a benchmark harness (examples/c/slice_raycast_bench.c). Experimental, additive, not wired into mc_plotter: benchmarking shows it only beats the already row-coherent point-query fill at very high resolution (~8K+) on dense models; it wins large on simple/coarse geometry. Kept as a tool + cross-check (it surfaced a lattice descent bug in the point-query fill). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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