feat(types): tipo Webpage + .gitignore del subrepo (issue 0027)

- examples/types.yaml: nuevo tipo Webpage (icono ti-file-text, fields
  url/title/status_code/content_type/fetched_at/html_path/markdown_path/
  screenshot_path/text_length/lang). Url queda como link suelto.
- types_registry.cpp: anade ti-file-text al mapa de codepoints Tabler.
- .gitignore: cache/, graph_explorer.db (jobs+layouts), build artifacts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

examples/types.yaml

@@ -110,6 +110,25 @@ entities:
       - { name: title,  type: string }
       - { name: domain, type: string }
 
+  # Documento web descargado. Issue 0027: tipo separado de Url para nodos
+  # con cuerpo cacheado (HTML+markdown+screenshot). Los enrichers
+  # fetch_webpage / extract_links / extract_text_entities lo pueblan.
+  - name: Webpage
+    color: "#89E0FC"
+    icon: ti-file-text
+    principal_field: url
+    fields:
+      - { name: url,             type: url, required: true }
+      - { name: title,           type: string }
+      - { name: status_code,     type: int }
+      - { name: content_type,    type: string }
+      - { name: fetched_at,      type: date }
+      - { name: html_path,       type: string }
+      - { name: markdown_path,   type: string }
+      - { name: screenshot_path, type: string }
+      - { name: text_length,     type: int }
+      - { name: lang,            type: string }
+
   # Nodo tabla — cuadrado (regla de forma). Issue 0010: contenedor con
   # filas que son nodos del grafo.
   - name: Table