feat: funciones Python infra y tipos Python (core, datascience, infra)

Infra: cache_to_file, cache_to_sqlite, http_download_file, http_get_json,
http_post_json, read_file_with_encoding, safe_extract_zip, scan_directory,
setup_logger, normalize_zip_filenames.
Tipos: 30+ tipos core (agent_action, context, task, message, parse_result...),
6 tipos datascience (entity_candidate, extraction_result...), 2 tipos infra.

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

python/functions/infra/http_get_json.md

@@ -0,0 +1,41 @@
+---
+name: http_get_json
+kind: function
+lang: py
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "http_get_json(url: str, headers: dict[str, str] | None = None, params: dict[str, str] | None = None, timeout: float = 30.0) -> dict"
+description: "GET request que espera JSON. Agrega Accept: application/json automaticamente. Lanza RuntimeError si status >= 400 con status code, url truncada y primeros 200 chars del body."
+tags: [http, json, get, client, network, stdlib, infra]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: ["json", "urllib.error", "urllib.parse", "urllib.request"]
+tested: true
+tests:
+  - "mock de respuesta 200 con JSON"
+  - "mock de respuesta 404 → error con status code"
+  - "mock de respuesta con JSON invalido → error descriptivo"
+  - "params serializados como query string"
+  - "headers custom enviados"
+test_file_path: "python/functions/infra/http_get_json_test.py"
+file_path: "python/functions/infra/http_get_json.py"
+---
+
+## Ejemplo
+
+```python
+data = http_get_json(
+    "https://api.example.com/users",
+    params={"page": "1", "limit": "50"},
+    headers={"X-Api-Key": "secret"},
+)
+print(data["total"])
+```
+
+## Notas
+
+Solo usa stdlib (urllib). Sin dependencias externas. El error incluye los primeros 200 chars del body para facilitar debugging en produccion. Params se serializa con urlencode antes de concatenar a la URL.