raystack / compass / 24588971682

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fix: recursive CTE bugs in edge traversal and improve HNSW params

- GetBidirectional: split into seed CTE + single recursive graph CTE
  to fix PostgreSQL error 42P19 (recursive reference in non-recursive term)
- traverse (GetDownstream/GetUpstream): fix JOIN condition that caused
  combinatorial explosion (19K edges instead of 1) by correcting
  column references in the format string
- Bump HNSW index params from m=16/ef=64 to m=32/ef=256 for better
  semantic search recall

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