docs: capital-ready validation roadmap implementation plan
14 TDD tasks across 4 sections: data integrity (TemporalGuard, SlippageModel), walk-forward robustness (DegradationTracker, NoiseInjector, SensitivityAnalyzer), risk enforcement (RiskAction, RiskEnforcer, GraduatedRecovery, CorrelationMonitor), and E2E integration (pipeline traits, RiskGate, operating modes, DriftResponder, observability). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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