Function create_deep_agent 

pub fn create_deep_agent(
    model: Arc<dyn ChatModel>,
    options: DeepAgentOptions,
) -> Result<CompiledGraph<MessageState>, SynapticError>

Create a deep agent with the given model and options.

Assembles a middleware stack and tool set:

1. DeepMemoryMiddleware — loads memory file into system prompt
2. SkillsMiddleware — progressive disclosure of skills
3. FilesystemMiddleware — 6–7 filesystem tools + large result eviction
4. SubAgentMiddleware — task tool for child agent spawning
5. DeepSummarizationMiddleware — auto-summarize context on overflow
6. PatchToolCallsMiddleware — fix malformed tool calls
7. User-provided middleware