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duet--classify-path turns a path string into a plist describing where it lives and how to reach it: :locality (local or remote), :method, :user, :host, :port, :localname, and :hop for multi-hop paths. It's the pure foundation the transfer-spec and connection layers build on (Phase 1 in the design spec).
TRAMP does the dissection, so any path file-remote-p recognizes is remote and everything else is local. A local path is expanded, so a leading ~ resolves to the home directory. A remote localname is kept verbatim because a ~ there is the remote home, not this machine's. Classification never signals: an incomplete string like /ssh:host that TRAMP rejects as a remote name falls back to local, since validating raw TRAMP input belongs to the connection reader, not here.
I probed TRAMP's real contract before writing the tests (port comes back as a string, a multi-hop path reports the final host with the leading hops in :hop), so the Normal/Boundary/Error cases assert what TRAMP actually returns rather than what I'd have guessed.
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