fix: always return minimal n8n output

- Node now outputs only stdout (parsed or raw) plus optional stderr

- Keep output stable across all operations to simplify n8n mappings

- Trim trailing newlines from runner stdout/stderr for cleaner display

- Bump server version to 1.0.3 to ship runner/output changes

- Bump n8n node package via versioned build artifacts

app/runner.py

@@ -36,8 +36,8 @@ async def execute_command(args:list[str], cwd:Path, stdin:str|None, timeout:floa
     timed_out = True
 
   duration_ms = int((time.perf_counter() - started) * 1000)
-  stdout = stdout_b.decode(errors="replace")
-  stderr = stderr_b.decode(errors="replace")
+  stdout = stdout_b.decode(errors="replace").rstrip()
+  stderr = stderr_b.decode(errors="replace").rstrip()
   exit_code = process.returncode if process.returncode is not None else -1
 
   if timed_out: