mat, sensing-server, and train all depended on signal with default features
enabled, which pulled ndarray-linalg → openblas-src → vcpkg/system-BLAS through
the entire workspace. --no-default-features at the workspace root could not
opt out of BLAS, breaking cargo build / cargo test on Windows without vcpkg.
Set default-features = false on the signal dep in all three consumers so the
flag actually propagates. Also gate signal::ruvsense::field_model::tests
::test_estimate_occupancy_noise_only with #[cfg(feature = "eigenvalue")] —
the test unwraps a NotCalibrated stub when eigenvalue is compiled out.
Validated: cargo test --workspace --no-default-features → 1,538 passed,
0 failed, 8 ignored. ESP32-S3 on COM7 still streams live CSI.
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