Sandbox migration#

The historical pyradar_sandbox directory was removed before v1. Reusable radar behavior was rewritten against current contracts; copied reference code, GUI helpers, and hardware side effects were not moved into the installable package.

Historical area	v1 destination	Decision
`base/*`	`pyradar.base`	Replaced by immutable validated models and named data containers.
`rsp/fft.py`	`pyradar.rsp.fft`	Rewritten with parameter and Radar-aware APIs.
`rsp/doa.py`	`pyradar.rsp.doa`	Rewritten; adds arbitrary geometry, duplicate phase centers, MUSIC, Capon, Bartlett, and ESPRIT.
`rsp/cfar.py`, STFT detection helpers	`pyradar.rsp.cfar`	Replaced by statistically parameterized CA/GOCA/SOCA/OS CFAR and NMS. Experimental undocumented variants were not promoted.
`rsp/stft.py`	`pyradar.rsp.time_frequency`	Replaced by general STFT, micro-Doppler, and zoom FFT results with physical coordinates.
clutter and integration helpers	`pyradar.rsp.preprocessing`	Reimplemented as composable axis-aware functions.
`sim/core.py`, `demo_sim.py`	`pyradar.sim`	Rebuilt as point-target/path ADC synthesis, scene sampling, range-image rendering, and a `Radar.simulate` entry point.
Mitsuba and experimental LiDAR ray scripts	`pyradar.sim.raytracing`	Replaced by backend-neutral ray math and an optional Trimesh CPU backend. Hard-coded assets, GUI state, and backend selection were removed.
converter helpers	`pyradar.utils.converter` and `Radar` properties	Rewritten with SI units, radians, exact FFT bin centers, and validation.
point-cloud helpers	`pyradar.utils.pointcloud`	Retains deterministic voxel/random sampling, bounds, and point-to-point ICP without requiring Open3D.
pose helpers	`pyradar.utils.geometry`	Retains FLU rigid transform creation, composition, inversion, and point transforms. Camera/Torch conversion utilities were outside radar scope.
heat-map helpers	`pyradar.utils.vis`	Replaced by typed RD, RA, and point-cloud plotting functions.
TI DCA1000/TSW1400 parsing	`pyradar.utils.io.ti`	Reimplemented as pure decoders and Radar-validated frame readers. Live UDP/serial control is intentionally not imported by the package.
copied `reference_mmwave` tree	no vendored package	Algorithm concepts are covered by native v1 implementations and tests. The third-party source remains available through its upstream project and is not exposed under the `pyradar` namespace.

The migration is intentionally behavioral rather than path-compatible. The experimental 0.1 imports are not aliases in v1; callers should build a Radar, use pyradar.rsp, pyradar.sim, or pyradar.utils, and rely on named dimensions at raw-array boundaries.