v0.67.0

What's Changed

• feat(spanner): event queue optimization, property graph AST, hybrid RRF search, and ADK artifact store by @cofin in #834
• ci: bump the actions group across 1 directory with 4 updates by @dependabot[bot] in #836
• refactor(build): upgrade Python baseline to 3.11+ and add Python 3.15 support by @cofin in #835
• fix(core,adapters): improve driver lifecycle, query compilation, and adapter consistency by @cofin in #837
• feat(adbc): add Oracle, Db2, GizmoSQL, and Quack driver support by @cofin in #839

Full Changelog: v0.66.0...v0.67.0