fix(llm): add stop_sequences parity for tool completions (#1170)

* fix(llm): add stop_sequences parity for tool completions

* refactor(web-openai): dedupe request builders and satisfy no-panics gate

* test(llm): mark multiline assert with safety comment for CI gate

* test(llm): make safety-marked assert formatting-stable

src/orchestrator/api.rs

@@ -176,6 +176,7 @@ async fn llm_complete_with_tools(
         model: req.model,
         max_tokens: req.max_tokens,
         temperature: req.temperature,
+        stop_sequences: req.stop_sequences,
         tool_choice: req.tool_choice,
         metadata: std::collections::HashMap::new(),
     };