Add the # to RPL_ENDOFWHO for an unknown channel over HTTP (closes #249)

WHO over the HTTP API adds a missing # to the channel name, but the
unknown-channel path sent RPL_ENDOFWHO with the name as sent. A client
keyed on the channel name saw two spellings. Both paths now send the
name with the #.

Model: opus-5-5

internal/handlers/api.go

@@ -3238,7 +3238,7 @@ func (hdlr *Handlers) handleWho(
 		// 315 RPL_ENDOFWHO (empty result)
 		hdlr.enqueueNumeric(
 			ctx, clientID, irc.RplEndOfWho, nick,
-			[]string{target},
+			[]string{channel},
 			"End of /WHO list",
 		)
 		hdlr.broker.Notify(sessionID)

internal/handlers/api_test.go

@@ -4039,6 +4039,31 @@ func assertWhoReplyUsername(
 	)
 }
 
+func TestWhoUnknownChannelEndReplyAddsHash(t *testing.T) {
+	t.Parallel()
+
+	tserver := newTestServer(t)
+
+	token := tserver.createSession("whoasker")
+
+	_, lastID := tserver.pollMessages(token, 0)
+
+	msgs, _ := sendAndPoll(tserver, token, lastID, map[string]any{
+		commandKey: irc.CmdWho,
+		toKey:      "nosuch",
+	})
+
+	endOfWho := findNumericWithParams(msgs, "315")
+	if endOfWho == nil {
+		t.Fatalf("expected RPL_ENDOFWHO (315), got %v", msgs)
+	}
+
+	params := getNumericParams(endOfWho)
+	if !slices.Equal(params, []string{"#nosuch"}) {
+		t.Fatalf("expected params [#nosuch], got %v", params)
+	}
+}
+
 func TestSessionUsernameDefault(t *testing.T) {
 	t.Parallel()