feat: pilot bounded incremental review cadence

[BaseInfinity]

Summary

• add a ten-delivery pilot for incremental checkpoint review and bounded completion review
• record structured cadence, reconciliation, confidence, cost, and delivery evidence
• add a caller-independent summary tool with strict CSV schema validation
• document the pilot across the shipped SDLC layers

Verification

• 11/11 proof groups passed on the final tree
• exact-diff self-review clean
• Sol High: no actionable findings
• Fable High: certified; non-blocking P2/P3 follow-ups remain bounded outside this patch

Refs #109

Issue #109 intentionally remains open until the ten representative deliveries are recorded and evaluated.