Merge conflict resolution: community-graph-projection compact stream types

PR #316 (codex/community-graph-projection) conflicted with main on useStreamingGraph.ts and graphPerf.test.ts. Main introduced CompactNodeTuple/CompactEdgeTuple array types with length validation and renamed functions to nodeFromCompactFrame. The PR branch added a new short object format (nodeFromShortCompactFrame) for community-aware data with fields like community, communityConfidence, communitySecondary. The API serializer (graph.ts) used object literals typed as CompactNodeTuple/CompactEdgeTuple, causing TS2353 errors since tuples don't accept named object keys.