sync graph.jsonl: regenerated from updated graph.jsonld

sync graph.jsonld: link llms-txt-writer/jsonld-knowledge-graph + CA-ANS cross-reference

docs: rewrite dataset card to 5-line federation (3 agent-design + 2 cross-cutting clusters)

feat: regenerate row-wise jsonl (40 nodes)

feat: refresh graph.jsonld (31 -> 40 nodes; adds 2 ResearchLine + concepts for cross-cutting cluster)

Initial release: shimo4228 research program hub federation graph mirror (graph.jsonld + graph.jsonl)

initial commit