feat: add calibrated health score and survival depth

include/onod3000.h

@@ -13,6 +13,26 @@ bool onod_run(const char* test,
               size_t len,
               double* result /* length >= 3 */);
 
+// Health score of a sample. NaN marks values that are not available.
+typedef struct {
+    double p_combined;    // calibrated p-value of all tests combined
+    double score;         // -log10(p_combined), capped at 12; < 2 pass, < 4 suspect
+    int    verdict;       // 0 pass, 1 suspect, 2 fail, 3 insufficient data (< 256 bytes)
+    int    weakest;       // index of the test with the lowest calibrated p, -1 if none
+    double depth_bits;    // log2 of the bits in the longest passing prefix
+    bool   depth_complete;// true if every prefix up to the whole sample passed
+    double p_cal[15];     // calibrated p-value per test, NaN if skipped
+} OnodScore;
+
+// Returns true on success. With depth, also computes the survival depth (up to 2x slower).
+bool onod_score(const uint8_t* samples,
+                size_t len,
+                bool depth,
+                OnodScore* result);
+
+// Name of test index 0..14 as used in OnodScore.p_cal, NULL past the last one.
+const char* onod_test_name(size_t index);
+
 #ifdef __cplusplus
 }
 #endif