7f6a5bb2c8
Replace the custom TestLLM Effect service with the real LLM layer + TestLLMServer HTTP mock for 9 of 10 processor tests. Tests now exercise the full HTTP→SSE→AI SDK→processor pipeline. - Export Provider.defaultLayer for test layer composition - Add boot() helper for common service access (processor, session, provider) - Extend TestLLMServer with usage support and httpError step type - Tool abort test registers a real tool with hanging execute - Reasoning test stays with in-process TestLLM (needs fine-grained events)