feat(graph): two-tier L3 alignment thresholds + reconcile co-mention hint — same-type 0.85, cross-type 0.92

feat(graph): L3 semantic entity alignment via bge embeddings

feat(graph): map-reduce KG extraction — per-chunk two-pass under key-pool concurrency

feat(graph): entity alignment — normalize + fuzzy alias + relation predicates

deploy: accept .docx and .pptx uploads

deploy: hybrid retrieval + reranker

feat: video ingest support and error_message column

initial backend deploy