At the half-integer center the -0.1/-0.5 circles were already rejected
as unresolved, so the case did not exercise the finite/positive-radius
guard; an integer center makes the squared radius mark one solid cell.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
_static_circles now checks finite center/radius and radius > 0 before
build_flag_mask (a negative radius squared to a one-cell solid), matching
prepare_fine_boundary. objects is converted to a tuple before the
emptiness test so an empty iterable takes the body-free path.
CPU tests: negative/NaN radius and nonfinite center rejected before CUDA;
empty iterator skips circle preparation.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
blocks.cu: BlockCurvedBoundary passes the receiver-local core cell and the
block-offset fi to the unchanged apply_bouzidi_link (Uw=Vw=0, obs=nullptr),
so k_s and the q<1/2 donor follow the window image the next pull reads.
BlockStep takes nullable block-cell flags; solid cores store NaN each step.
Adds core/flags.cuh, core/obs.cuh and boundary/curved_boundary.cuh.
block_stepper.py: objects=() accepts stationary passive circles only; host
preparation rejects before CUDA: non-circle/moving/actuated/sensor roles,
overlap, domain-edge contact, and any fluid core (all rows/columns, periodic
neighbors) whose pull from a solid lacks exactly one cut link. Uses
map_cut_links for unique receiver owner/local writer. Order per step:
halo copy -> BFL -> pull/collide, no copy in between. Fluid-only
initialize validation; solids NaN.
Tests: CPU rejections/tables; GPU 32x24, nu .1, 8 steps, circle
(15.5,11.5) R4.3 with halo-write and halo-donor presence asserted,
1x1/2x2/4x2 bit-identical, finite fluid/NaN solid, FP64 BFL+pull/SRT
<= 3e-6 on fluid; drift reported. Body-free gate unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
close() now clears _module (initialized to None) inside the active
context together with the function references; lifecycle test asserts
it is retained on failed activation and cleared after close.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
step() reads _dst/_src before the launch; without them the failed-launch
test raised AttributeError instead of the intended RuntimeError.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
