List the available Fusion configurations — name, label, panel (analysis_models), judge (orchestrator/'Fuse with'), reasoning_effort, temperature, description. Call this FIRST when the user asks to 'use Fusion' without naming a config: show the list, let them choose (quality, budget, or a custom one), then run fusion_start with preset:''.

Start an OpenRouter Fusion deliberation in the BACKGROUND and return a job_id immediately (never times out), then call fusion_result with the job_id. Pick a config with preset:'' — call fusion_list to see them (quality, budget, + custom configs). Default: quality. reasoning_effort and temperature default to the config's; override per call if needed.

Fetch the result of a fusion_start job. Long-polls up to ~45s: returns the synthesized answer when ready, or {status:'running'} (call again with the same job_id). Fast per call, so it never hits the client timeout.