[Mission/feat] Hypothesis → Challenge auto-create for top-N ranked falsifiable hypotheses done

Bridge step 4 of mission pipeline. Top-ranked hypotheses with concrete predictions should automatically become Exchange challenges with bounty tiers. Acceptance: - New CLI: \`scidex challenge auto-from-hypotheses --min-score 7.5 --max-create 10\`. - Selection: hypotheses with composite_score >= --min-score AND falsifiability_score >= 6 AND has at least one prediction in predictions_json AND no existing challenge linked. - Generate challenge title (\"Resolve: \"), description (cite hypothesis URL + predictions), bounty tier from composite_score (5/15/50/250 USDC). - Insert into challenges table with source_hypothesis_id; mint markets via existing market_seed path. - Backfill: run once for current top-50 hypotheses; expect 5–15 new challenges. - Spec: docs/planning/specs/mission_hypothesis_to_challenge.md. Why now: hypotheses pile up, Exchange/challenges page is empty (4767 broken links suggest data starvation, not just routing). This converts ranking signal into capital-backed positions.

Git Commits (2)

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Sibling Tasks in Quest (Continuous Proposal Generation) ↗