Add experimental typed Nexus workflow clients

CHANGELOG.md

@@ -38,6 +38,11 @@ relevant information.
   differs from the command that produced it.
 
 ### Added
+* Workflows can call typed Nexus service operations with `nexus_client`, `execute`, and `start`
+  when the `experimental` feature is enabled, using service definitions from the draft Nexus Rust
+  SDK. `NexusServiceClient` uses `NexusServiceClientOptions`; calls take `NexusOperationOptions`
+  and return a typed result or `NexusOperationHandle`. The `cancellation_type` option is a
+  non-optional enum that defaults to waiting for cancellation completion.
 * Experimental Event Groups support (requires the `experimental` feature). Event Groups
   are workflow-level metadata that group related history events for UI and observability.
   `EventGroup::new` takes a required ID (used verbatim; do not put secrets in it);

Cargo.toml

@@ -37,6 +37,7 @@ prost-types = { version = "0.7", package = "prost-wkt-types" }
 pbjson = "0.9"
 pbjson-build = "0.9"
 serde_json = "1.0"
+nexus-rpc = { git = "https://github.com/nexus-rpc/sdk-rust", rev = "a6ebfedd3bb4c751d68f385521d70033a09fe5ee" }
 
 [workspace.lints.rust]
 unreachable_pub = "warn"

crates/common-wasm/src/data_converters.rs

@@ -4,6 +4,8 @@
 mod failure_converter;
 mod well_known;
 
+#[cfg(feature = "experimental")]
+pub use failure_converter::NexusOperationDecodeHint;
 pub use failure_converter::{
     ActivityExecutionDecodeHint, CancelExternalWorkflowDecodeHint,
     ChildWorkflowExecutionDecodeHint, ChildWorkflowStartDecodeHint, CommonAttributes,