v2.140.0

What's Changed

• Observability: request ids, recall explain and degraded, embedder metrics and health, structured logs, recall log and /recalls page by @liliang-cn in #106
• Memories say how they are known: verified lessons apart from unverified guesses by @liliang-cn in #109
• perf(graph): find_nodes folds each node once a call, not once a name by @lfoletti in #110

Full Changelog: v2.139.1...v2.140.0