v0.9.66rc001

What's Changed

• Introduce truss train subcommand, API stubs by @nnarayen in #1422
• Fix truss integration tests by @nnarayen in #1425
• implement internal_cache to enable node-level caching by @rcano-baseten in #1424
• Websocket support in chains (entrypoint only). by @marius-baseten in #1414
• Treat truss imports as first party, not third party by @nnarayen in #1426
• Support local truss source code, refactor common pydantic types by @nnarayen in #1427
• Support builder models in chains by @marius-baseten in #1420
• Bump briton-server to v0.17.0-v0.0.20; briton-python to v0.4.7 by @bdubayah in #1430

Full Changelog: v0.9.65...v0.9.66rc001