Composable process component that verifies all identified issues have been overview

Composable process component that verifies all identified issues have been addressed before a run completes. Designed for injection into convergence and quality-gate processes to enforce resolution accountability. The module provides three surfaces: - `evaluateCompleteness` — synchronous evaluation given explicit issue + resolution data - `checkCompleteness` — async convenience wrapper that mines a run directory for evidence - `completenessGateTask` — babysitter `defineTask` wrapper for harness-driven execution