Sync ES and Korean READMEs with the Devin CLI addition

Follow-up to #318, which updated only the English README. Bumps the agent badge 14->15, adds a Devin CLI install section before OpenClaw, and lists Devin CLI in the skill-capable host line. Also adds Swival to both host lines, which the translations were already missing.

README.es.md

@@ -15,7 +15,7 @@
   <img src="https://img.shields.io/github/stars/DietrichGebert/ponytail?style=flat-square&color=111111&label=stars" alt="Stars">
   <img src="https://img.shields.io/github/v/release/DietrichGebert/ponytail?style=flat-square&color=111111&label=release" alt="Release">
   <img src="https://img.shields.io/npm/v/@dietrichgebert/ponytail?style=flat-square&color=111111&label=npm" alt="npm">
-  <img src="https://img.shields.io/badge/funciona%20con-14%20agentes-111111?style=flat-square" alt="Works with 14 agents">
+  <img src="https://img.shields.io/badge/funciona%20con-15%20agentes-111111?style=flat-square" alt="Works with 15 agents">
   <img src="https://img.shields.io/badge/licencia-MIT-111111?style=flat-square" alt="MIT license">
 </p>
 
@@ -198,6 +198,14 @@ Reutiliza el `gemini-extension.json` de este repo. Una diferencia: Antigravity c
 
 Lee `AGENTS.md` desde la raíz del proyecto, sin configuración. Copia [`AGENTS.md`](AGENTS.md) a tu proyecto, o ejecuta `codewhale` desde un checkout de este repo. Eso es todo.
 
+### Devin CLI
+
+```bash
+devin plugins install DietrichGebert/ponytail
+```
+
+Instala ponytail como plugin de Devin; los skills quedan disponibles como `/ponytail:ponytail`, `/ponytail:ponytail-review`, etc.
+
 ### OpenClaw
 
 ```bash
@@ -232,7 +240,7 @@ Qué archivos corresponden a qué agente: [Portabilidad de agentes](docs/agent-p
 | `/ponytail-debt` | Recolecta los atajos marcados con `ponytail:` que dejaste pendientes en un registro, para que "después" no se convierta en "nunca". |
 | `/ponytail-help` | Referencia rápida de los comandos anteriores. |
 
-Los comandos requieren un host compatible con skills (Claude Code, Codex, OpenCode, Gemini, pi). En Codex son skills; se invocan con `@` (`@ponytail-review`). Los adaptadores de solo instrucciones (Cursor, Windsurf, Cline, Copilot, Kiro, Antigravity) cargan el ruleset permanente sin los comandos.
+Los comandos requieren un host compatible con skills (Claude Code, Codex, Devin CLI, OpenCode, Gemini, pi, Swival). En Codex son skills; se invocan con `@` (`@ponytail-review`). Los adaptadores de solo instrucciones (Cursor, Windsurf, Cline, Copilot, Kiro, Antigravity) cargan el ruleset permanente sin los comandos.
 
 ## Desarrollo
 

README.ko.md

@@ -15,7 +15,7 @@
   <img src="https://img.shields.io/github/stars/DietrichGebert/ponytail?style=flat-square&color=111111&label=stars" alt="Stars">
   <img src="https://img.shields.io/github/v/release/DietrichGebert/ponytail?style=flat-square&color=111111&label=release" alt="Release">
   <img src="https://img.shields.io/npm/v/@dietrichgebert/ponytail?style=flat-square&color=111111&label=npm" alt="npm">
-  <img src="https://img.shields.io/badge/works%20with-14%20agents-111111?style=flat-square" alt="Works with 14 agents">
+  <img src="https://img.shields.io/badge/works%20with-15%20agents-111111?style=flat-square" alt="Works with 15 agents">
   <img src="https://img.shields.io/badge/license-MIT-111111?style=flat-square" alt="MIT license">
 </p>
 
@@ -217,6 +217,14 @@ Swival도 프로젝트 루트의 `AGENTS.md`와 전역의 `~/.config/swival/AGEN
 
 명령줄에서는 `$` 접두사로 스킬을 명시적으로 켠다. 예: `$ponytail-review`.
 
+### Devin CLI
+
+```bash
+devin plugins install DietrichGebert/ponytail
+```
+
+ponytail을 Devin 플러그인으로 설치한다. 스킬은 `/ponytail:ponytail`, `/ponytail:ponytail-review` 등으로 쓸 수 있다.
+
 ### OpenClaw
 
 ```bash
@@ -252,7 +260,7 @@ Codex 확장을 쓰는 VS Code는 이 저장소가 함께 싣는 `AGENTS.md`를
 | `/ponytail-gain` | 벤치마크로 잰 효과 스코어보드(코드 절감, 비용 절감, 속도 향상)를 보여 준다. |
 | `/ponytail-help` | 위 명령들의 빠른 참조. |
 
-명령들은 스킬을 지원하는 호스트가 있어야 돈다(Claude Code, Codex, OpenCode, Gemini, pi). Codex에선 스킬이라 `@`로 부른다(`@ponytail-review`). 지시문 전용 어댑터(Cursor, Windsurf, Cline, Copilot, Kiro, Antigravity)는 명령 없이 늘 켜진 룰셋만 불러온다.
+명령들은 스킬을 지원하는 호스트가 있어야 돈다(Claude Code, Codex, Devin CLI, OpenCode, Gemini, pi, Swival). Codex에선 스킬이라 `@`로 부른다(`@ponytail-review`). 지시문 전용 어댑터(Cursor, Windsurf, Cline, Copilot, Kiro, Antigravity)는 명령 없이 늘 켜진 룰셋만 불러온다.
 
 ## Development