[mendsec]

What: Fixed a goroutine leak in pkg/ports/scanner.go where worker goroutines could block indefinitely on a channel send if the context was cancelled and the consumer stopped reading.
Why: Context cancellation must correctly tear down all resources to prevent memory/goroutine leaks.
Impact: Eliminates goroutine leaks on premature scan cancellations.
Measurement: Verified via runtime.NumGoroutine() delta in TestScanPortsPrematureCancel.
Closes Issue #105. RDP probe implemented in v0.4.0 via TPKT/X.224 CR in GrabBanners. SNMP deferred to Milestone 6 — requires UDP transport layer in pkg/ports (current engine is TCP-only). Tracked in #[new issue number].

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PR created automatically by Jules for task 11991126509079483471 started by @mendsec

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Up to standards ✅

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