Initial release release(core): 1.4.0a1 (#37132) Merge remote-tracking branch 'origin/master' into v1.4 feat(core): stream_events(version='v3') protocol (#37111) fix(core): preserve structured `inputs` on tool runs in tracers (#37108) release(perplexity): 1.2.0 (#37091) chore(docs): update x handle references (#37081) fix(core): make `removal` optional in `warn_deprecated` (#37056) fix(core): validate batch_size in _batch and _abatch to prevent infinite loop (#36663) chore(core): mark stream_v2/astream_v2 as beta (#36992) release(core): 1.3.2 (#36990) feat(core): add content-block-centric streaming (v2) (#36834) release(core): 1.3.1 (#36972) feat(core): allow _format_output to pass through list of ToolOutputMixin instances (#36963) chore: bump nbconvert from 7.17.0 to 7.17.1 in /libs/core (#36923) feat(core): Update inheritance behavior for tracer metadata for special keys (#36900) chore: bump langsmith from 0.7.13 to 0.7.31 in /libs/core (#36813) release(core): release 1.3.0 (#36851) release(core): 1.3.0a3 (#36829) chore(core): keep checkpoint_ns behavior in streaming metadata for backwards compat (#36828) feat(core): Add chat model and LLM invocation params to traceable metadata…