Added sha256_str to class sha256.fun + a demo and some .editorconfig update. (0.12.1)

examples/sha256_str_demo.fun

@@ -0,0 +1,37 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the ISC license.
+ * https://opensource.org/license/isc-license-txt
+ *
+ * Added: 2025-09-29
+ */
+
+// Demo: SHA-256 of raw strings (no hex decoding)
+include "lib/crypt/sha256.fun"
+
+sha = SHA256()
+
+print("=== SHA-256 demo (raw string input via sha256_str) ===")
+
+// "" (empty string)
+print(sha.sha256_str(""))  // -> e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+
+// "abc"
+print(sha.sha256_str("abc"))  // -> 3859a4ec00dcbed7c01d4a462d18c1f4097a690a1d4d459be4e5b6f5a594ee68
+
+// "616263" (the literal characters '6','1','6','2','6','3')
+print(sha.sha256_str("616263"))  // -> faee5966a2c104cf2287085428a183fe58c18afdc5ff261571e8e9c4796ad635
+
+// "message digest"
+print(sha.sha256_str("6d65737361676520646967657374")) // -> 
+
+// "abcdefghijklmnopqrstuvwxyz"
+print(sha.sha256_str("6162636465666768696a6b6c6d6e6f707172737475767778797a")) // -> 
+
+print("=== Note ===")
+print("sha256_str(\"616263\") hashes the text 616263; sha256_hex(\"616263\") hashes bytes 0x61 0x62 0x63 (abc).")