test(escrow): add timelock duration boundaries and royalty precision specs

tests/wave9_escrow_timelock_guard_test.rs

@@ -0,0 +1,28 @@
+#![no_std]
+#[cfg(test)]
+mod test {
+    extern crate std;
+    use std::println;
+
+    #[test]
+    fn test_wave9_escrow_timelock_duration_bounds() {
+        let min_timelock_secs: u64 = 3600; // 1 hr
+        let max_timelock_secs: u64 = 604800; // 7 days
+        let proposed_lock: u64 = 86400; // 24 hrs
+
+        assert!(proposed_lock >= min_timelock_secs, "proposed lock below minimum threshold");
+        assert!(proposed_lock <= max_timelock_secs, "proposed lock exceeds maximum safety window");
+    }
+
+    #[test]
+    fn test_wave9_basis_point_royalty_precision() {
+        let gross_amount: u128 = 250_000_0000; // 2500 tokens
+        let royalty_bps: u128 = 250; // 2.5%
+        let calculated_royalty = (gross_amount * royalty_bps) / 10_000;
+        let net_payout = gross_amount - calculated_royalty;
+
+        assert_eq!(calculated_royalty, 6_250_0000);
+        assert_eq!(net_payout, 243_750_0000);
+        assert_eq!(net_payout + calculated_royalty, gross_amount);
+    }
+}