fix: let voice/mute/kick/detach take --party

A host of two or more parties was told 'pass a name' by commands that
accepted no name flag, making moderation impossible. Mirrors the
--party flag invite already had.

tests/95-stub-roundtrip.bats

@@ -810,3 +810,30 @@ STUB
   ! grep -q "server-access -aw $USER" "$TMUX_LOG" || \
     fail "should not have attempted -aw before capability check"
 }
+
+@test "moderation accepts --party to disambiguate multiple hosted parties" {
+  "$PARTY_BIN" host alpha
+  "$PARTY_BIN" host bravo
+
+  # Without --party: ambiguous, must refuse and say so.
+  run "$PARTY_BIN" kick nobody
+  [ "$status" -ne 0 ]
+  [[ "$output" == *"multiple parties"* ]]
+
+  # With --party: resolves, and the server-access -d lands on bravo's
+  # socket specifically.
+  : > "$TMUX_LOG"
+  run "$PARTY_BIN" kick nobody --party bravo
+  [ "$status" -eq 0 ]
+  grep "server-access -d nobody" "$TMUX_LOG" | grep -q "party-$USER:bravo.d/sock"
+
+  : > "$TMUX_LOG"
+  run "$PARTY_BIN" voice nobody --party alpha
+  [ "$status" -eq 0 ]
+  grep "server-access -w nobody" "$TMUX_LOG" | grep -q "party-$USER:alpha.d/sock"
+
+  run "$PARTY_BIN" mute nobody --party alpha
+  [ "$status" -eq 0 ]
+  run "$PARTY_BIN" detach nobody --party alpha
+  [ "$status" -eq 0 ]
+}