Bootstrap OpenBitdo clean-room SDK and reliability milestone

sdk/tests/pid_matrix_coverage.rs

@@ -0,0 +1,16 @@
+use bitdo_proto::pid_registry;
+use std::fs;
+use std::path::PathBuf;
+
+#[test]
+fn pid_registry_matches_spec_rows() {
+    let manifest = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    let csv_path = manifest.join("../../../spec/pid_matrix.csv");
+    let content = fs::read_to_string(csv_path).expect("read pid_matrix.csv");
+    let rows = content
+        .lines()
+        .skip(1)
+        .filter(|l| !l.trim().is_empty())
+        .count();
+    assert_eq!(rows, pid_registry().len());
+}