fix(workspace): unblock --no-default-features build on Windows (#366, #415) (#425)

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.

CHANGELOG.md

@@ -7,6 +7,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- **Rust workspace build with `--no-default-features` on Windows** (#366, #415) —
+  `wifi-densepose-mat`, `wifi-densepose-sensing-server`, and `wifi-densepose-train`
+  all depended on `wifi-densepose-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 then could not opt out
+  of BLAS, breaking `cargo build` / `cargo test` on Windows without vcpkg. All
+  three consumers now declare `wifi-densepose-signal = { ..., default-features = false }`,
+  so `cargo test --workspace --no-default-features` builds cleanly without
+  vcpkg/openblas. Validated: 1,538 tests pass, 0 fail, 8 ignored.
+- **`signal` test `test_estimate_occupancy_noise_only` failed without `eigenvalue`** —
+  The test unwrapped the `NotCalibrated` stub returned when the BLAS-backed
+  `estimate_occupancy` is compiled out. Gated with `#[cfg(feature = "eigenvalue")]`
+  so it only runs when the real implementation is available.
+
 ## [v0.6.2-esp32] — 2026-04-20
 
 Firmware release cutting ADR-081 and the Timer Svc stack fix discovered during

rust-port/wifi-densepose-rs/Cargo.lock

@@ -7979,6 +7979,7 @@ dependencies = [
  "chrono",
  "clap",
  "futures-util",
+ "ruvector-mincut",
  "serde",
  "serde_json",
  "tempfile",

rust-port/wifi-densepose-rs/crates/wifi-densepose-mat/Cargo.toml

@@ -25,7 +25,7 @@ serde = ["dep:serde", "chrono/serde", "geo/use-serde"]
 [dependencies]
 # Workspace dependencies
 wifi-densepose-core = { version = "0.3.0", path = "../wifi-densepose-core" }
-wifi-densepose-signal = { version = "0.3.0", path = "../wifi-densepose-signal" }
+wifi-densepose-signal = { version = "0.3.0", path = "../wifi-densepose-signal", default-features = false }
 wifi-densepose-nn = { version = "0.3.0", path = "../wifi-densepose-nn" }
 ruvector-solver = { workspace = true, optional = true }
 ruvector-temporal-tensor = { workspace = true, optional = true }

rust-port/wifi-densepose-rs/crates/wifi-densepose-sensing-server/Cargo.toml

@@ -44,8 +44,11 @@ clap = { workspace = true }
 # Multi-BSSID WiFi scanning pipeline (ADR-022 Phase 3)
 wifi-densepose-wifiscan = { version = "0.3.0", path = "../wifi-densepose-wifiscan" }
 
-# Signal processing with RuvSense pose tracker (accuracy sprint)
+# Signal processing with RuvSense pose tracker (accuracy sprint).
-wifi-densepose-signal = { version = "0.3.0", path = "../wifi-densepose-signal" }
+# default-features = false drops the optional ndarray-linalg/BLAS chain so that
+# `--no-default-features` at the workspace root can produce a Windows-friendly
+# build without vcpkg/openblas (issue #366, #415).
+wifi-densepose-signal = { version = "0.3.0", path = "../wifi-densepose-signal", default-features = false }
 
 [dev-dependencies]
 tempfile = "3.10"

rust-port/wifi-densepose-rs/crates/wifi-densepose-signal/src/ruvsense/field_model.rs

@@ -1232,6 +1232,9 @@ mod tests {
         }
     }
 
+    // estimate_occupancy() falls back to a NotCalibrated stub without the
+    // `eigenvalue` feature, so this test only makes sense with BLAS enabled.
+    #[cfg(feature = "eigenvalue")]
     #[test]
     fn test_estimate_occupancy_noise_only() {
         let config = FieldModelConfig {

rust-port/wifi-densepose-rs/crates/wifi-densepose-train/Cargo.toml

@@ -27,7 +27,7 @@ cuda = ["tch-backend"]
 
 [dependencies]
 # Internal crates
-wifi-densepose-signal = { version = "0.3.0", path = "../wifi-densepose-signal" }
+wifi-densepose-signal = { version = "0.3.0", path = "../wifi-densepose-signal", default-features = false }
 wifi-densepose-nn = { version = "0.3.0", path = "../wifi-densepose-nn" }
 
 # Core