Enforce schema contract: levers count + required summary

[neoneye]

Summary

• Add min_length=5, max_length=5 to DocumentDetails.levers to enforce exactly 5 levers per response
• Make summary a required str field (was Optional[str] with default=None)

Evidence

• Run 52 (haiku) produced 16 levers (hong_kong_game) due to unconstrained list
• Null summaries in runs 47 (14/15), 48 (10/15), 51 (4/15) silently accepted
• Both code-review agents independently identified these as the top priority fix

Expected Impact

• 6-lever overflow becomes a parse-time error instead of silently corrupting output
• Null summaries become parse-time errors instead of being saved as successful
• All models affected; no prompt or logic changes required

Test plan

• Run experiments with all 7 models
• Verify lever count violations cause parse errors (not silent corruption)
• Verify summary is populated in successful runs
• Run analysis pipeline and check assessment verdict

🤖 Generated with Claude Code