tokenTransport now delegates CloseIdleConnections to the underlying
*http.Transport so http.Client.CloseIdleConnections() works through
the wrapper. Three plugin Close() methods updated to unwrap via
HTTPClientTransport before calling CloseIdleConnections.
RoundTrip now short-circuits when caller already set Authorization,
avoiding an unnecessary req.Clone allocation on the pass-through path.
- hosts/hosts.go: add package and symbol doc comments, fix missing
httpLoader.Close() in Close()
- hosts/plugin: add doc comments for HTTP and gRPC plugin types
- hop/hop.go: add doc comments, accumulate reload/parse errors via errors.Join
instead of silently discarding them
- hop/plugin/http.go: add doc comments and missing Close() method
- Add unit tests for hosts (580 lines) and hop (991 lines)
ginuerzh