feat(metabase): nuevos modulos — snippets, notifications, dashboard_filters

Tres modulos nuevos con funciones CRUD completas:
- snippets: list, get, create, update, archive (SQL reutilizable)
- notifications: list, create_card_alert, create_dashboard_subscription, update, delete
- dashboard_filters: add_dashboard_filter (parameter_mappings sobre cards existentes)

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

python/functions/metabase/metabase_archive_snippet.md

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+---
+name: metabase_archive_snippet
+kind: function
+lang: py
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "def metabase_archive_snippet(client: MetabaseClient, snippet_id: int) -> dict"
+description: "Archiva un SQL snippet en Metabase. Wrapper sobre metabase_update_snippet con archived=True."
+tags: [metabase, snippet, archive, api, python]
+uses_functions: [metabase_update_snippet_py_infra]
+uses_types: [MetabaseClient_go_infra]
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: [httpx]
+params:
+  - name: client
+    desc: "instancia autenticada de MetabaseClient"
+  - name: snippet_id
+    desc: "ID numerico del snippet a archivar"
+output: "dict: snippet con archived=True y updated_at actualizado"
+tested: false
+tests: []
+test_file_path: ""
+file_path: "python/functions/metabase/snippets.py"
+---
+
+## Ejemplo
+
+```python
+# Archivar snippet obsoleto
+result = metabase_archive_snippet(client, 42)
+print(result["archived"])  # True
+
+# Listar snippets activos despues de archivar
+active = metabase_list_snippets(client, archived=False)
+assert all(not s["archived"] for s in active)
+```
+
+## Notas
+
+Los snippets archivados no aparecen en el autocomplete de queries nativas en el editor de Metabase.
+Las cards que ya referencian el snippet siguen funcionando correctamente despues de archivar.
+Para desarchivar, usar metabase_update_snippet(client, snippet_id, archived=False).