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SDK enhancements for endpoint agent embedding: - ScanWithController for pause/resume and live stats - OnProgress callback for periodic progress reporting - TaskID injection into every scan result - ScanController with goroutine-safe pause/resume/stats - Multi-target stats aggregation (race-free) UDP plugin infrastructure: - PluginTypeUDP registry with dedicated dispatch path - DialUDP on ScanSession with rate limiting and packet counting - UDP plugins bypass TCP port scan, probe targets directly - FilterService excludes UDP plugins from TCP port matching SNMP plugin (first UDP plugin): - SNMPv2c GetRequest probe for sysDescr detection - Community string brute force (public/private/community/etc) - Pure stdlib implementation (encoding/asn1) - Registered as safe default plugin on port 161/UDP Tests: 95.7% SDK coverage, race-free, 50+ new test cases