Fix AGPL identifier and strengthen contributor license grant

- Use AGPL-3.0-or-later (not AGPL-3.0) in all READMEs to match LICENSE
- Replace weak "retains the right" clause in CONTRIBUTING.md with explicit
  contributor license grant for commercial sublicensing

Author: lawrencecchen

CONTRIBUTING.md

@@ -99,4 +99,7 @@ See `docs/ghostty-fork.md` for details on fork changes and conflict notes.
 
 ## License
 
-By contributing to this repository, you agree that your contributions are licensed under the project's GNU Affero General Public License v3.0 or later (`AGPL-3.0-or-later`). Manaflow, Inc. retains the right to offer contributed code under a commercial license.
+By contributing to this repository, you agree that:
+
+1. Your contributions are licensed under the project's GNU Affero General Public License v3.0 or later (`AGPL-3.0-or-later`).
+2. You grant Manaflow, Inc. a perpetual, worldwide, non-exclusive, royalty-free, irrevocable license to use, reproduce, modify, sublicense, and distribute your contributions under any license, including a commercial license offered to third parties.

README.ar.md

@@ -268,6 +268,6 @@ cmux مجاني ومفتوح المصدر وسيظل كذلك دائمًا. إذ
 
 ## الرخصة
 
-cmux مفتوح المصدر بموجب [AGPL-3.0](LICENSE).
+cmux مفتوح المصدر بموجب [AGPL-3.0-or-later](LICENSE).
 
 إذا لم تستطع مؤسستك الامتثال لـ AGPL، فهناك ترخيص تجاري متاح. تواصل مع [founders@manaflow.com](mailto:founders@manaflow.com) للتفاصيل.

README.bs.md

@@ -268,6 +268,6 @@ cmux je besplatan, otvorenog koda i uvijek će biti. Ako želite podržati razvo
 
 ## Licenca
 
-cmux je otvorenog koda pod [AGPL-3.0](LICENSE) licencom.
+cmux je otvorenog koda pod [AGPL-3.0-or-later](LICENSE) licencom.
 
 Ako vaša organizacija ne može ispuniti uslove AGPL-a, dostupna je komercijalna licenca. Kontaktirajte [founders@manaflow.com](mailto:founders@manaflow.com) za detalje.

README.da.md

@@ -268,6 +268,6 @@ cmux er gratis, open source og vil altid være det. Hvis du gerne vil støtte ud
 
 ## Licens
 
-cmux er open source under [AGPL-3.0](LICENSE).
+cmux er open source under [AGPL-3.0-or-later](LICENSE).
 
 Hvis din organisation ikke kan overholde AGPL, er en kommerciel licens tilgængelig. Kontakt [founders@manaflow.com](mailto:founders@manaflow.com) for detaljer.

README.de.md

@@ -268,6 +268,6 @@ cmux ist kostenlos, Open Source und wird es immer sein. Wenn Sie die Entwicklung
 
 ## Lizenz
 
-cmux ist Open Source unter [AGPL-3.0](LICENSE).
+cmux ist Open Source unter [AGPL-3.0-or-later](LICENSE).
 
 Wenn Ihre Organisation AGPL nicht einhalten kann, ist eine kommerzielle Lizenz verfügbar. Kontaktieren Sie [founders@manaflow.com](mailto:founders@manaflow.com) für Details.

README.es.md

@@ -268,6 +268,6 @@ cmux es gratuito, de código abierto, y siempre lo será. Si deseas apoyar el de
 
 ## Licencia
 
-cmux es código abierto bajo [AGPL-3.0](LICENSE).
+cmux es código abierto bajo [AGPL-3.0-or-later](LICENSE).
 
 Si su organización no puede cumplir con AGPL, hay una licencia comercial disponible. Contacte a [founders@manaflow.com](mailto:founders@manaflow.com) para más detalles.

README.fr.md

@@ -268,6 +268,6 @@ cmux est gratuit, open source, et le restera toujours. Si vous souhaitez souteni
 
 ## Licence
 
-cmux est open source sous [AGPL-3.0](LICENSE).
+cmux est open source sous [AGPL-3.0-or-later](LICENSE).
 
 Si votre organisation ne peut pas se conformer à l'AGPL, une licence commerciale est disponible. Contactez [founders@manaflow.com](mailto:founders@manaflow.com) pour plus de détails.

README.it.md

@@ -268,6 +268,6 @@ cmux è gratuito, open source, e lo sarà sempre. Se vuoi supportare lo sviluppo
 
 ## Licenza
 
-cmux è open source sotto [AGPL-3.0](LICENSE).
+cmux è open source sotto [AGPL-3.0-or-later](LICENSE).
 
 Se la tua organizzazione non può conformarsi all'AGPL, è disponibile una licenza commerciale. Contatta [founders@manaflow.com](mailto:founders@manaflow.com) per i dettagli.

README.ja.md

@@ -268,6 +268,6 @@ cmuxは無料でオープンソースであり、今後もそうあり続けま
 
 ## ライセンス
 
-cmuxは[AGPL-3.0](LICENSE)の下でオープンソースです。
+cmuxは[AGPL-3.0-or-later](LICENSE)の下でオープンソースです。
 
 AGPLに準拠できない組織向けに、商用ライセンスもご用意しています。詳細は[founders@manaflow.com](mailto:founders@manaflow.com)までお問い合わせください。

README.km.md

@@ -269,6 +269,6 @@ cmux គឺឥតគិតថ្លៃ ជាកូដបើកចំហ (open s
 
 ## អាជ្ញាប័ណ្ណ (License)
 
-cmux គឺជាកម្មវិធីប្រភពបើកចំហក្រោម [AGPL-3.0](LICENSE)។
+cmux គឺជាកម្មវិធីប្រភពបើកចំហក្រោម [AGPL-3.0-or-later](LICENSE)។
 
 ប្រសិនបើស្ថាប័នរបស់អ្នកមិនអាចអនុលោមតាម AGPL បាន អាជ្ញាប័ណ្ណពាណិជ្ជកម្មមានផ្តល់ជូន។ ទាក់ទង [founders@manaflow.com](mailto:founders@manaflow.com) សម្រាប់ព័ត៌មានលម្អិត។