Dapr 1.19 cuts AI workflow overhead, drops control-plane service

Diagrid released Dapr 1.19 with changes targeting long-running AI agent workflows. Previously, the workflow engine sent the full execution history to workers on every step; now only new events are transmitted, reducing latency and memory use. An opt-in preview feature called WorkflowsFastPath cuts median step latency from 553 milliseconds to 153 milliseconds. A new mode retires the Placement control-plane service, letting the Scheduler handle actor placement, reducing disruption during scaling events. New alpha building blocks include a Vector API for embedding search, a Binary Store for large file streaming, and a compile-time actor SDK for .NET.