CLI: shorter, plainer output

Tables name a journal source by its first two units or identifiers;
guard test shows 20 matching lines and addresses (--all for all), no
/32; Housecarl connection errors without Go's request URL, said once by
guard check; status tells "not running" from "no permission"; bans says
when there are none; "1 ban lifted".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/housecarl/client.go

@@ -27,9 +27,10 @@ const Prefix = "/api/v1"
 
 // Client talks to one Housecarl.
 type Client struct {
-	base  string
-	token string
-	http  *http.Client
+	base   string
+	socket string
+	token  string
+	http   *http.Client
 }
 
 // Options say how to reach Housecarl.
@@ -72,7 +73,7 @@ func New(o Options) (*Client, error) {
 		}
 		tr.TLSClientConfig = cfg
 	}
-	return &Client{base: base, token: strings.TrimSpace(o.Token), http: &http.Client{Transport: tr, Timeout: timeout}}, nil
+	return &Client{base: base, socket: o.Socket, token: strings.TrimSpace(o.Token), http: &http.Client{Transport: tr, Timeout: timeout}}, nil
 }
 
 // Error is an error answer from Housecarl.
@@ -89,6 +90,32 @@ func (e *Error) Error() string {
 	return e.Message
 }
 
+// UnreachableError is a request Housecarl never answered: no
+// connection, a TLS failure, a timeout.
+type UnreachableError struct {
+	Where string
+	Err   error
+}
+
+func (e *UnreachableError) Error() string {
+	err := e.Err
+	var ue *url.Error
+	if errors.As(err, &ue) {
+		err = ue.Err // without the method and the URL with its query
+	}
+	return "Housecarl at " + e.Where + " doesn't answer: " + err.Error()
+}
+
+func (e *UnreachableError) Unwrap() error { return e.Err }
+
+// where is where the client reaches Housecarl, for messages.
+func (c *Client) where() string {
+	if c.socket != "" {
+		return c.socket
+	}
+	return c.base
+}
+
 // Refused reports whether Housecarl refused a request for good: asking
 // again won't help (a bad request, no permission, an address never
 // banned). Anything else (no answer, a server error) is worth retrying.
@@ -123,7 +150,7 @@ func (c *Client) do(ctx context.Context, method, path string, query url.Values,
 	}
 	resp, err := c.http.Do(req)
 	if err != nil {
-		return err
+		return &UnreachableError{Where: c.where(), Err: err}
 	}
 	defer resp.Body.Close()
 	data, _ := io.ReadAll(io.LimitReader(resp.Body, 16<<20))