Support Digispark dtiny AVR framework (#190)

Author: zackees

crates/fbuild-packages/assets/avr_frameworks.json

@@ -25,6 +25,24 @@
       "checksum": null,
       "validation_path": "cores/tinymodern/Arduino.h"
     },
+    "dtiny": {
+      "name": "digistump-avr-core",
+      "github": "ArminJo/DigistumpArduino",
+      "version": "1.7.2",
+      "tag_prefix": "",
+      "checksum": null,
+      "validation_path": "cores/tiny/Arduino.h",
+      "core_dir": "tiny"
+    },
+    "pro": {
+      "name": "digistump-avr-core",
+      "github": "ArminJo/DigistumpArduino",
+      "version": "1.7.2",
+      "tag_prefix": "",
+      "checksum": null,
+      "validation_path": "cores/pro/Arduino.h",
+      "core_dir": "pro"
+    },
     "MiniCore": {
       "name": "minicore",
       "github": "MCUdude/MiniCore",

crates/fbuild-packages/src/library/avr_framework.rs

@@ -372,4 +372,29 @@ mod tests {
         assert_eq!(entry.name, "arduino-megaavr-core");
         assert_eq!(entry.core_dir.as_deref(), Some("arduino"));
     }
+
+    #[test]
+    fn test_digispark_dtiny_registered() {
+        let registry = load_registry();
+        assert!(
+            registry.contains_key("dtiny"),
+            "dtiny must be registered for Digistump/Digispark boards"
+        );
+    }
+
+    #[test]
+    fn test_digispark_dtiny_lookup() {
+        let entry = lookup_entry("dtiny").unwrap();
+        assert!(entry.github.contains("DigistumpArduino"));
+        assert_eq!(entry.name, "digistump-avr-core");
+        assert_eq!(entry.core_dir.as_deref(), Some("tiny"));
+    }
+
+    #[test]
+    fn test_digispark_pro_lookup() {
+        let entry = lookup_entry("pro").unwrap();
+        assert!(entry.github.contains("DigistumpArduino"));
+        assert_eq!(entry.name, "digistump-avr-core");
+        assert_eq!(entry.core_dir.as_deref(), Some("pro"));
+    }
 }