docs: add Spanish (es) translation (#2095)

Adds a complete Spanish translation of the ECC documentation under
docs/es/, mirroring the Turkish (docs/tr/) translation in scope.
141 files covering agents, commands, rules, skills, contexts, examples,
and core docs. Updates root README.md with the Spanish language link.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/es/rules/python/patterns.md

@@ -0,0 +1,39 @@
+---
+paths:
+  - "**/*.py"
+  - "**/*.pyi"
+---
+# Patrones de Python
+
+> Este archivo extiende [common/patterns.md](../common/patterns.md) con contenido específico de Python.
+
+## Protocol (Duck Typing)
+
+```python
+from typing import Protocol
+
+class Repository(Protocol):
+    def find_by_id(self, id: str) -> dict | None: ...
+    def save(self, entity: dict) -> dict: ...
+```
+
+## Dataclasses como DTOs
+
+```python
+from dataclasses import dataclass
+
+@dataclass
+class CreateUserRequest:
+    name: str
+    email: str
+    age: int | None = None
+```
+
+## Context Managers y Generadores
+
+- Usar context managers (sentencia `with`) para gestión de recursos
+- Usar generadores para evaluación lazy e iteración eficiente en memoria
+
+## Referencia
+
+Ver skill: `python-patterns` para patrones completos incluyendo decoradores, concurrencia y organización de paquetes.