feat(viz): graph_types modelo extendido + EntityType/RelationType + flags (issue 0049e)

Extiende el modelo agnostico de graph_types.h para soportar shapes/iconos/
filtros/labels/streaming sin acoplar a backend. Migra el unico consumer
(demos_graph) en el mismo cambio.

- GraphNode v2: type_id + shape_override/color_override/size_override +
  flags (NF_PINNED/VISIBLE/SELECTED/HOVERED) + label_idx + user_data.
- GraphEdge v2: type_id + style_override + flags (EF_DIRECTED/VISIBLE).
- EntityType / RelationType: tablas en GraphData (types, rel_types).
- Helpers de resolucion (resolve_node_color/shape/size, resolve_edge_*)
  y constructores ergonomicos (graph_node, graph_edge, entity_type,
  relation_type) — sentinel-based para herencia automatica del tipo.
- graph_renderer v1.4: lee NF_VISIBLE / EF_VISIBLE, resuelve apariencia
  via override → EntityType → fallback indexado por type_id. Skipea
  aristas con endpoints invisibles. Shapes siguen pintandose como
  circulo (0049f cableara el dispatch real).
- graph_force_layout v1.2: pinned ahora vive en flags & NF_PINNED.
- graph_viewport v1.1: hover/seleccion publican NF_HOVERED/SELECTED en
  el grafo (clear-then-set). Drag usa NF_PINNED. Tooltip muestra Type/
  user_data en lugar de community/value/label.
- demos_graph: 8 EntityType (paleta antigua) + 1 RelationType. type_id
  por cluster. user_data = indice numerico del nodo. Apariencia visual
  identica al pre-cambio.
- test_graph_types.cpp: 12 casos cubriendo helpers, defaults, bitmask
  manipulation y resoluciones override-vs-EntityType. test_graph_edge_
  static actualizado al nuevo modelo (ya no tiene .color directo).
- 4 .md de tipos nuevos (graph_node, graph_edge, entity_type,
  relation_type) + GraphData v2.0 actualizado.

Tests: 31/31 ctest verdes (incluye test_visual golden).

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

dev/issues/README.md

@@ -59,7 +59,7 @@
 | [0049b](completed/0049b-cpp-bump-gl-43.md) | Bump OpenGL 3.3 → 4.3 core en cpp/framework | completado | alta | infra | parte de 0049 |
 | [0049c](completed/0049c-graph-renderer-tier1.md) | graph_renderer Tier 1: RGBA8, orphan, frustum cull, auto-pause | completado | alta | perf | parte de 0049 |
 | [0049d](completed/0049d-graph-edges-vertex-pulling.md) | Aristas via vertex pulling con TBO | completado | alta | perf | parte de 0049 |
-| [0049e](0049e-graph-types-extended.md) | graph_types modelo extendido + EntityType/RelationType | pendiente | alta | feature | parte de 0049 |
+| [0049e](completed/0049e-graph-types-extended.md) | graph_types modelo extendido + EntityType/RelationType | completado | alta | feature | parte de 0049 |
 | [0049f](0049f-graph-renderer-symbols.md) | Renderer extendido: shapes SDF, icon atlas, flechas, edge styles | pendiente | alta | feature | parte de 0049 |
 | [0049g](0049g-graph-source-operations.md) | graph_sources: lector operations.db + abstraccion funcional | pendiente | alta | feature | parte de 0049 |
 | [0049h](0049h-graph-force-layout-gpu.md) | graph_force_layout_gpu: compute shader + spatial hash | pendiente | media-alta | feature | parte de 0049 |