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Implement DNS interception on Windows with dual-mode support: - NRPT for --intercept-mode=dns: catch-all rule redirecting all DNS to ctrld's listener, with GP vs local path detection - WFP for --intercept-mode=hard: sublayer with callout filters intercepting port 53 traffic - NRPT probe-and-heal for async Group Policy refresh race - Service registry verification for intercept mode persistence - NRPT diagnostics script for troubleshooting Includes WFP technical reference docs and Windows test scripts. Squashed from intercept mode development on v1.0 branch (#497).