chore: gitignore completo — __pycache__, .env, venv, node_modules

Añadidos patrones recursivos para Python (__pycache__, .pyc, .venv),
Node (node_modules), y secrets (.env, .env.*) en cualquier subdirectorio.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -25,7 +25,17 @@ registry.db-wal
 *~
 
 # Secrets
-.env
+**/.env
+**/.env.*
+
+# Python
+**/__pycache__/
+**/*.pyc
+**/*.pyo
+python/.venv/
+
+# Node / pnpm
+**/node_modules/
 
 # OS
 .DS_Store