Docs: update sections with license (was MIT to GPLv3)

Signed-off-by: alexvoste <alexvostedev@proton.me>

Author: alexvoste

README.md

@@ -28,7 +28,7 @@
   </table>
 </div>
 
-> **Version:** 5.1.0 &nbsp;·&nbsp; **Language:** Go &nbsp;·&nbsp; **License:** MIT &nbsp;·&nbsp; **Platform:** Linux · Windows · macOS
+> **Version:** 5.1.0 &nbsp;·&nbsp; **Language:** Go &nbsp;·&nbsp; **License:** GPLv3 &nbsp;·&nbsp; **Platform:** Linux · Windows · macOS
 
 ForgeZero is a high-performance, zero-overhead build tool for assembly, C, C++, Objective-C, and Gloria developers. It wraps NASM, GAS, FASM, GCC, Clang, Zig, and LD into a single unified command-line interface — no Makefiles, no build scripts, no configuration required to get started.
 
@@ -3444,26 +3444,24 @@ Repository: [github.com/forgezero-cli/ForgeZero](https://github.com/forgezero-cl
 
 ## 42. License
 
-ForgeZero is released under the **MIT License**.
+ForgeZero is released under the **GPLv3 License**.
 
 ```
-MIT License
 
-Copyright (c) AlexVoste
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * Copyright (c) 2026 ForgeZero-cli
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 ```
 
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