docs: add analysis.md frontmatter for fn_registry indexing

analysis.md

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+---
+name: retrieving_graphs
+lang: py
+domain: datascience
+description: "Backends de grafos para retrieval con LLM. Comparacion de stores y construccion de grafos de inteligencia OSINT."
+tags: [graph, retrieval, llm, osint, knowledge-graph, jupyter]
+uses_functions: []
+uses_types: []
+framework: "jupyterlab"
+entry_point: "notebooks/"
+dir_path: "analysis/retrieving_graphs"
+repo_url: "https://gitea-dgg044oo04woo4ggcsws4gk0.organic-machine.com/dataforge/retrieving_graphs"
+---
+
+## Notas
+
+Notebooks de exploracion de retrieval sobre grafos:
+- 01: backends de grafos
+- 02: retrieval con LLM
+- 03: grafo de inteligencia OSINT
+
+Datos en `data/` (gitignored).