refactor: rename llm worker crate to engine

crates/llm-engine/tests/ui/locked_register_tool.rs

@@ -0,0 +1,28 @@
+use llm_engine::Engine;
+use llm_engine::llm_client::capability::{
+    CacheStrategy, ModelCapability, StructuredOutput, ToolCallingSupport,
+};
+use llm_engine::llm_client::scheme::anthropic::AnthropicScheme;
+use llm_engine::llm_client::transport::{HttpTransport, ResolvedAuth};
+use std::sync::Arc;
+
+fn main() {
+    let cap = ModelCapability {
+        tool_calling: ToolCallingSupport::Parallel,
+        structured_output: StructuredOutput::JsonSchema,
+        reasoning: None,
+        vision: false,
+        prompt_caching: CacheStrategy::Auto,
+    };
+    let client = HttpTransport::new(
+        AnthropicScheme::new(),
+        "dummy-model".to_string(),
+        "http://localhost:11434".to_string(),
+        ResolvedAuth::None,
+        cap,
+    );
+    let engine = Engine::new(client);
+    let mut locked = engine.lock();
+    let def: llm_engine::tool::ToolDefinition = Arc::new(|| panic!("unused"));
+    let _ = locked.register_tool(def);
+}

crates/llm-engine/tests/ui/locked_register_tool.stderr

@@ -0,0 +1,8 @@
+error[E0599]: no method named `register_tool` found for struct `Engine<HttpTransport<AnthropicScheme>, Locked>` in the current scope
+  --> tests/ui/locked_register_tool.rs:27:20
+   |
+27 |     let _ = locked.register_tool(def);
+   |                    ^^^^^^^^^^^^^ method not found in `Engine<HttpTransport<AnthropicScheme>, Locked>`
+   |
+   = note: the method was found for
+           - `Engine<C>`

crates/llm-engine/tests/ui/tool_server_handle_register_tool.rs

@@ -0,0 +1,28 @@
+use llm_engine::Engine;
+use llm_engine::llm_client::capability::{
+    CacheStrategy, ModelCapability, StructuredOutput, ToolCallingSupport,
+};
+use llm_engine::llm_client::scheme::anthropic::AnthropicScheme;
+use llm_engine::llm_client::transport::{HttpTransport, ResolvedAuth};
+use std::sync::Arc;
+
+fn main() {
+    let cap = ModelCapability {
+        tool_calling: ToolCallingSupport::Parallel,
+        structured_output: StructuredOutput::JsonSchema,
+        reasoning: None,
+        vision: false,
+        prompt_caching: CacheStrategy::Auto,
+    };
+    let client = HttpTransport::new(
+        AnthropicScheme::new(),
+        "dummy-model".to_string(),
+        "http://localhost:11434".to_string(),
+        ResolvedAuth::None,
+        cap,
+    );
+    let engine = Engine::new(client);
+    let handle = engine.tool_server_handle();
+    let def: llm_engine::tool::ToolDefinition = Arc::new(|| panic!("unused"));
+    let _ = handle.register_tool(def);
+}

crates/llm-engine/tests/ui/tool_server_handle_register_tool.stderr

@@ -0,0 +1,10 @@
+error[E0624]: method `register_tool` is private
+  --> tests/ui/tool_server_handle_register_tool.rs:27:20
+   |
+27 |     let _ = handle.register_tool(def);
+   |                    ^^^^^^^^^^^^^ private method
+   |
+  ::: src/tool_server.rs
+   |
+   |     pub(crate) fn register_tool(&self, factory: EngineToolDefinition) {
+   |     ----------------------------------------------------------------- private method defined here