The leeway decision already exists at chat/runtime.py::_surface_estimate
(accrual.license is a real LicenseDecision) but is discarded — never threaded to
CognitiveTurnResult, and the workbench can't import reliability_gate. Brief lays
out: the exact producer seam, the LicenseDecision/ReachPolicy -> LeewayEvidence
mapping, two honest layers (STRICT-now / earned-APPROXIMATE), the firewall-safe
workbench mapping, constraints, a minimal additive Layer-1 first PR, and 4 open
questions.
