scan: genericize the caller-supplied unit-key docs (no external-source naming)
The ScanOptions.unit_key path is a generic primitive — a caller-supplied Unit Key that bypasses keydb lookup. Doc comments + a tracing log named a specific external source; reworded to neutral 'out-of-band / external key service' so the library makes no assumptions about where the key came from.
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@@ -15,7 +15,7 @@
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//! fastest/closest first.
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//!
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//! Default impls return empty / `None` so backends only override
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//! the methods they actually support — an HTTP keyserver might
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//! the methods they actually support — an external key service might
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//! implement only `lookup_disc_by_hash`, while a local file might
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//! implement all five.
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//!
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