Harden SEC quarterly actuals lineage and pilot readiness

[YuzeJ21]

Summary

• add versioned SEC fiscal-quarter actuals lineage with explicit per-metric Q4 proof gates
• harden Earnings Nowcast to fail closed when point-in-time consensus or calibration evidence is unavailable
• improve public page answer ordering and preserve advanced evidence behind explicit review paths
• align pilot documentation, methodology boundaries, and release checks

Verification

• make public-check
• 2,568 tests passed
• dashboard smoke passed
• Home, Stock Selector, Single-Stock Report, Data Health, and Proof History browser QA passed
• generated CSV/report churn remains excluded and unstaged

Boundaries

• research-only; no investment advice or trading integration
• synthetic nowcast fixtures are test evidence only
• real-company nowcast remains withheld without point-in-time consensus
• numerical Beat/Miss probability remains withheld without calibration evidence
• Q4 actuals remain withheld without explicit SEC-filed per-metric Q4 proof