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ruv
a6ac08c662
Pass 2 of the implementation plan. Adds magnetic-field synthesis at arbitrary sensor locations, all in f64 for near-field stability per plan §7-1. Public API (re-exported from lib.rs): - dipole_field(&DipoleSource, sensor_pos) -> ([f64; 3], near_field_flag) Closed-form analytic dipole: B = (μ₀ / 4π r³)[3(m·r̂)r̂ − m] (Jackson 3e §5.6). - current_loop_field(&CurrentLoop, sensor_pos) -> (Vec3, flag) Numerical Biot–Savart over n_segments straight chords (default 64); flag fires if any chord midpoint < R_MIN_M (1 mm) of sensor. - ferrous_field(&FerrousObject, ambient_b, sensor_pos) -> (Vec3, flag) Linear induced moment m = χ·V·H_ambient (Cullity & Graham 2e §2), re-radiates as a dipole. - scene_field_at(&Scene, sensor_pos) -> (Vec3, flag) — aggregate. - scene_field_at_sensors(&Scene) -> Vec<(Vec3, flag)> — for every sensor. - R_MIN_M = 1 mm — near-field clamp constant. Pass 2 acceptance per plan §3 — n=8 RMS gate ≤ 0.5%. Test `dipole_n8_directions_within_half_percent_rms` independently recomputes the formula in-test rather than calling the implementation twice, so the gate guards against an implementation that accidentally agrees with a buggy reference. 7 new tests: - on-axis dipole matches B_z = μ₀ m / (2π z³) - equatorial dipole matches B_z = -μ₀ m / (4π r³) - n=8 directions RMS ≤ 0.5% — Pass 2 acceptance gate - on-axis current loop matches μ₀ I a² / [2(a²+z²)^(3/2)] - near-field r < 1 mm clamps to (0, flag=true) - zero-ambient ferrous object emits zero field - two opposite dipoles aggregate to zero at colocated sensor Validated: - cargo test -p nvsim → 19 passed (was 12; +7). - cargo test --workspace --no-default-features → 1,594 passed, 0 failed, 8 ignored (was 1,587; +7). - ESP32-S3 on COM7 streaming live CSI (cb #8900). Co-Authored-By: claude-flow <ruv@ruv.net>