[Agora] Run multi-agent debates on 3 high-priority open artifacts done

The Artifact Debates quest needs debates run on top-ranked artifacts to improve their quality scores and generate new hypotheses. ## Steps 1. Query: `SELECT a.id, a.title, a.artifact_type, a.quality_score FROM artifacts a WHERE a.lifecycle_state = 'active' AND NOT EXISTS (SELECT 1 FROM debate_sessions ds WHERE ds.analysis_id = a.id) AND a.quality_score > 0.5 ORDER BY a.quality_score DESC LIMIT 3` 2. For each artifact: trigger a 4-round debate using POST /api/analyses or by calling agent.py with the artifact as the research question 3. Link debate session to artifact via analysis_id 4. Extract hypotheses from the debate synthesis ## Acceptance Criteria - [ ] 3 top artifacts now have at least 1 debate session - [ ] Debate transcripts stored - [ ] Hypotheses extracted and scored - [ ] artifact.debate_count updated

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