* fix(geo numerical robustness): parse_hgt underflow panic + haversine asin-domain NaN
Targeted numerical-robustness audit of wifi-densepose-geo (ADR-154-class sweep).
Two real bugs, each pinned by a fails-on-old test:
1. terrain.rs parse_hgt — usize underflow panic on degenerate input.
`side = sqrt(n_samples)`; for empty / sub-2x2 buffers side <= 1, so
`1.0 / (side - 1)` underflows `usize` (panic "attempt to subtract with
overflow" in debug; wraps to a huge value in release → garbage/inf
cell_size_deg that poisons every ElevationGrid::get). A truncated HTTP
body or a 404 HTML page reaches parse_hgt. Now bails with a clear error
when side < 2.
2. coord.rs haversine — asin domain overflow → NaN for (near-)antipodal
points. Floating rounding can push `h.sqrt()` to 1.0 + ~4e-16, and
`asin(>1)` is NaN (verified: pair (-44.4994,-178.95722)→(44.49939999,
1.04278001) yields h=1.0000000000000004). A NaN distance silently breaks
all downstream `<`/`>` comparisons. Clamp into [0,1] before asin.
Also pins the ±90° pole-singularity (cos(lat)=0 division) as no-panic; the
ENU transform itself is unchanged (no behavior change for valid inputs).
Tests: wifi-densepose-geo 9→15 lib (6 new), 8 integration unchanged. 0 failed.
Co-Authored-By: claude-flow <ruv@ruv.net>
* test(pointcloud robustness): pin NaN-state-poisoning resistance + degenerate voxel fusion
Numerical-robustness audit of wifi-densepose-pointcloud. No bug found — the
crate is confirmed-robust against the proven NaN-state-poisoning class that bit
calibration/vitals. This adds regression pins documenting why:
1. csi_pipeline.rs — persistent auto-accumulating state (occupancy EMA,
vitals) is provably self-healing. The UDP parser only emits finite
amplitudes/phases (sqrt/atan2 of i8), and even an adversarial hand-built
CsiFrame with NaN/inf amplitudes+phases cannot latch non-finite state:
motion_score = (NaN/100).min(1.0) → 1.0; breathing path → 0 → clamp(5,40)
→ 5.0; tomography EMA uses only integer rssi. The new test injects 40
poisoned frames and asserts occupancy/vitals stay finite AND the pipeline
recovers to an in-range estimate afterward — so a future refactor that drops
a `.min`/`.clamp` self-heal would fail this pin.
2. fusion.rs — fuse_clouds voxel averaging is div-by-zero-safe (per-voxel
count >= 1 by construction). Pins empty / single-point / all-coincident
inputs as no-panic with finite output.
No behavior change. Tests: wifi-densepose-pointcloud 18→22 (4 new), 0 failed.
Co-Authored-By: claude-flow <ruv@ruv.net>
* docs(geo/pointcloud robustness): CHANGELOG + ADR-154 sibling-crate sweep note
Record the wifi-densepose-geo + wifi-densepose-pointcloud numerical-robustness
audit under CHANGELOG [Unreleased] → Fixed, and a sibling-crate-extension note
on the ADR-154 horizon ledger (these crates are outside ADR-154's signal scope
but the sweep is the same ADR-154 class).
Co-Authored-By: claude-flow <ruv@ruv.net>
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