Deleted: kernels/refinement.cu and step/patch_step.cu (PatchExplode,
PatchFineStep, PatchCoarseStep, the CELERIS_REFINEMENT_AUDIT counters);
in FixedPatchStepper the dense branches of _build_level/_build_pair/_hop,
_apply_fine_boundary, the fine-level CurvedLinkSoA wiring (_fine_curved,
_fine_flags, _curved, _link_tables, its set_jet_amplitude/initialize/close
paths) and the now-vacuous 'requires all-blocked' guards (shifted,
projected, channel, raw exchange, several L1 rectangles, depth >= 3).
level_blocks is required: one tile (by, bx) of positive integers per level,
else ValueError before any device work naming the whole-level tile
((ny, nx) at the root, the fine window shape for one rectangle) as always
valid. No automatic tile choice. Removed route: None in level_blocks
(dense or mixed dense/blocked storage); parity of D/D, D/B and B/B is
recorded at 1573942 and 2469af7.
Kept: the uniform-grid solver (uniform.cu, Simulation, CurvedLinkSoA,
CurvedBoundaryKernel), FixedPatch2D, pinned historical runners.
Docs: compiler entries, BlockExplode comment, lifecycle, supported_settings.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
