feat(viz): graph_sources lector operations.db + streaming (issue 0049g)

- graph_load_from_operations: SQLite read-only, schema-detect (type_ref/type,
  from_entity/source, to_entity/target, name/type, weight, updated_at).
- 16-color indigo palette por hash FNV1a32 del nombre de tipo. user_data
  por nodo es FNV1a64(entity.id) — deterministico entre cargas.
- Label pool interno: metadata.name (JSON simple) > entities.name > id.
- graph_free libera nodes/edges/types/rel_types/labels/strdup'd names via
  arena_map (GraphData* -> arena).
- Streaming pull-based con tiebreak (updated_at, id) y crecimiento x2 de
  capacidad. Tipos nuevos descubiertos en stream se anaden a types.
- Tests: fixture in-memory (3 entity types, 2 rel types, 10 entities,
  15 relations) + smoke contra apps/script_navegador/operations.db.
- Issue movido a completed/.

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

dev/issues/README.md

@@ -61,7 +61,7 @@
 | [0049d](completed/0049d-graph-edges-vertex-pulling.md) | Aristas via vertex pulling con TBO | completado | alta | perf | parte de 0049 |
 | [0049e](completed/0049e-graph-types-extended.md) | graph_types modelo extendido + EntityType/RelationType | completado | alta | feature | parte de 0049 |
 | [0049f](completed/0049f-graph-renderer-symbols.md) | Renderer extendido: shapes SDF, icon atlas, flechas, edge styles | completado | alta | feature | parte de 0049 |
-| [0049g](0049g-graph-source-operations.md) | graph_sources: lector operations.db + abstraccion funcional | pendiente | alta | feature | parte de 0049 |
+| [0049g](completed/0049g-graph-source-operations.md) | graph_sources: lector operations.db + abstraccion funcional | completado | 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 |
 | [0049i](0049i-graph-layouts-static.md) | graph_layouts (radial/hierarchical/fixed) + viewport multi-select | pendiente | media | feature | parte de 0049 |
 | [0049j](0049j-graph-labels.md) | graph_labels: render etiquetas con LabelPolicy | pendiente | media | feature | parte de 0049 |