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e1f4897269
* 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>