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

src/vm/logic/neq.c

@@ -1,3 +1,36 @@
+/**
+ * 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 neq.c
+ * @brief Implements the OP_NEQ opcode for inequality comparison in the VM.
+ *
+ * This file handles the OP_NEQ instruction, which checks if two values are not equal.
+ * The values are popped from the stack, and the result (1 or 0) is pushed back.
+ *
+ * Behavior:
+ * - Pops two values from the stack.
+ * - Checks if the values are not equal.
+ * - Pushes 1 (true) or 0 (false) onto the stack.
+ *
+ * Error Handling:
+ * - Exits with an error if the operands are of incompatible types.
+ *
+ * Example:
+ * // Bytecode: OP_NEQ
+ * // Stack before: [42, 10]
+ * // Stack after: [1]
+ *
+ * @author Johannes Findeisen
+ * @date 2025-10-16
+ */
+
 case OP_NEQ: {
     Value b = pop_value(vm);
     Value a = pop_value(vm);