Added tons of opcode documentation, changed license to ISC and a lot of file refactoring.

src/vm/core/load_const.c

@@ -1,3 +1,30 @@
+/**
+ * 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
+ */
+
+/**
+* @file load_const.c
+ * @brief Implements the OP_LOAD_CONST opcode for loading constants in the VM.
+ *
+ * This file handles the OP_LOAD_CONST instruction, which loads a constant value
+ * from the bytecode's constant pool onto the stack.
+ *
+ * Behavior:
+ * - operand is index into constant pool
+ * - Pushes copy of constant onto stack
+ *
+ * Error Handling:
+ * - Exits if invalid constant index
+ *
+ * @author Johannes Findeisen
+ * @date 2025-10-16
+ */
+
 case OP_LOAD_CONST: {
     int idx = inst.operand;
     if (idx < 0 || idx >= f->fn->const_count) {