feat: Extract from switchyard-server into switchyard-runner (#517)

* feat: Extract from switchyard-server into switchyard-runner

These pieces will be shared by integrations, particularly the NeMo-Relay
plugin.

Implements: #514

Assisted-by: Codex:5.6 Sol high
Assisted-by: Claude:Opus 5 medium
Signed-off-by: Graham King <grahamk@nvidia.com>

Author: grahamking

Cargo.lock

@@ -8,6 +8,7 @@ members = [
     "crates/libsy-llm-client",
     "crates/switchyard-py",
     "crates/protocol",
+    "crates/switchyard-runner",
     "crates/switchyard-server",
     "crates/switchyard-skill-distillation",
     "crates/switchyard-soak",
@@ -40,6 +41,7 @@ serde_json = { version = "1", features = ["preserve_order"] }
 switchyard-libsy = { path = "crates/libsy", version = "0.2.0" }
 switchyard-llm-client = { path = "crates/libsy-llm-client", version = "0.2.0" }
 switchyard-protocol = { path = "crates/protocol", version = "0.2.0" }
+switchyard-runner = { path = "crates/switchyard-runner", version = "0.2.0" }
 switchyard-server = { path = "crates/switchyard-server", version = "0.2.0" }
 switchyard-translation = { path = "crates/switchyard-translation", version = "0.2.0" }
 thiserror = "2"

Cargo.toml

@@ -44,13 +44,8 @@ impl PyServer {
             .map_err(|error| ServerConfigError::new_err(error.to_string()))?;
         let caller_auth_by_model = state
             .models()
-            .map(|model| {
-                state
-                    .caller_auth_kind(model)
-                    .map(|kind| (model.to_string(), kind))
-            })
-            .collect::<ServerResult<HashMap<_, _>>>()
-            .map_err(server_error)?;
+            .map(|model| (model.to_string(), state.caller_auth_kind(model)))
+            .collect::<HashMap<_, _>>();
         let runtime = pyo3_async_runtimes::tokio::get_runtime();
         let server = {
             let _guard = runtime.enter();

crates/switchyard-py/src/server_bindings.rs

@@ -0,0 +1,30 @@
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+[package]
+name = "switchyard-runner"
+version.workspace = true
+description = "Configured routing execution for Switchyard serving surfaces"
+authors.workspace = true
+edition.workspace = true
+homepage = "https://github.com/NVIDIA-NeMo/Switchyard"
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+publish = ["crates-io"]
+
+[dependencies]
+libsy = { package = "switchyard-libsy", path = "../libsy", version = "0.2.0" }
+reqwest.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+switchyard-llm-client.workspace = true
+switchyard-protocol.workspace = true
+thiserror.workspace = true
+toml = "1.1"
+tracing.workspace = true
+
+[dev-dependencies]
+async-trait.workspace = true
+futures-util.workspace = true
+tokio.workspace = true