fix: a transcript rescue never replaces an earlier one

The destination name has one-second granularity and mv overwrites.
Closing, re-hosting and closing the same party name within a second
would lose the first transcript while reporting success. Fall back to
a PID-suffixed name when the destination already exists.

party

@@ -943,7 +943,11 @@ rescue_transcript() {
             sleep 1
         done
     fi
-    _rt_dest="$HOME/party-$_rt_name-$(date -u '+%Y%m%d-%H%M%S').log"
+    _rt_dest="$HOME/party-$_rt_name-$(date -u '+%Y%m%d-%H%M%S')"
+    # Same name rescued twice within a second (close, re-host, close):
+    # mv would replace the earlier transcript without a word.
+    [ ! -e "$_rt_dest.log" ] || _rt_dest="$_rt_dest-$$"
+    _rt_dest="$_rt_dest.log"
     mv "$_rt_dir/log" "$_rt_dest" 2>/dev/null || { _rt_dest=''; return 1; }
     return 0
 }

tests/85-clean.bats

@@ -34,6 +34,22 @@ teardown() { teardown_party_sandbox; }
   grep -q "the night" "$HOME"/party-crashed-*.log
 }
 
+@test "a rescue never replaces an earlier transcript of the same second" {
+  export HOME="$PARTY_TMP/home"
+  mkdir -p "$HOME" "$PARTY_TMP/bin"
+  # Freeze the clock so both rescues compute the same destination.
+  printf '#!/bin/sh\necho 20260101-000000\n' > "$PARTY_TMP/bin/date"
+  chmod +x "$PARTY_TMP/bin/date"
+  printf 'earlier\n' > "$HOME/party-crashed-20260101-000000.log"
+  ensure_party_dir "$USER" crashed
+  printf 'later\n' > "$PARTY_SOCKET_DIR/party-$USER:crashed.d/log"
+
+  PATH="$PARTY_TMP/bin:$PATH" run "$PARTY_BIN" clean
+  [ "$status" -eq 0 ]
+  grep -q earlier "$HOME/party-crashed-20260101-000000.log"
+  grep -lq later "$HOME"/party-crashed-20260101-000000-*.log
+}
+
 @test "clean removes a crash-before-bind dir (no sock at all)" {
   mkdir "$PARTY_SOCKET_DIR/party-$USER:stillborn.d"
   run "$PARTY_BIN" clean