fix(rawcli): drop extra blank line between trace lines

The trace formatter's line now carries a trailing newline; rawcli was
stripping only a leading one (.lstrip), so the trailing \n survived and
the printer added another -> a blank line between every trace line (and a
\n\n join inside render_exchange). Use .strip("\n") so it's correct
whether the formatter emits a leading or trailing newline.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pm3py/cli/rawcli/trace_view.py

@@ -18,7 +18,7 @@ def render_exchange(command: bytes, response: bytes | None, *,
     if present, a ``Tag → Reader`` line for ``response``. ``is_tty`` forces/suppresses ANSI."""
     decoder, crc_len = _PROTOCOLS.get(protocol, (None, 0))
     fmt = TraceFormatter(mode="reader", decoder=decoder, crc_len=crc_len, is_tty=is_tty)
-    lines = [fmt.format(0, bytes(command)).lstrip("\n")]
+    lines = [fmt.format(0, bytes(command)).strip("\n")]
     if response:
-        lines.append(fmt.format(1, bytes(response)).lstrip("\n"))
+        lines.append(fmt.format(1, bytes(response)).strip("\n"))
     return "\n".join(lines)