Operator: tee relay/console output to content/operator_relay.log

Every field bug this session needed the relay's OWN view to diagnose,
but the app only shows it in the (post-mortem-unreadable) GUI log pane.
Now _console_output also appends to content/operator_relay.log (fresh
per session; stderr is merged so relay tracebacks are captured too).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tools/btoperator.py

@@ -566,6 +566,10 @@ class Operator(QMainWindow):
             for tag in tags:
                 host, _, port = tag.rpartition(":")
                 args.append("%s:%d" % (host, int(port) - 1))
+        try:                                    # fresh relay log per session
+            open(os.path.join(CONTENT, "operator_relay.log"), "w").close()
+        except OSError:
+            pass
         self.console_proc = QProcess(self)
         self.console_proc.setProcessChannelMode(QProcess.MergedChannels)
         self.console_proc.readyReadStandardOutput.connect(self._console_output)
@@ -630,6 +634,15 @@ class Operator(QMainWindow):
             return
         data = bytes(self.console_proc.readAllStandardOutput()).decode(
             "utf-8", "replace")
+        # ALSO tee the relay/console output to a file -- the GUI log pane is
+        # not readable post-mortem, and every field bug so far needed the
+        # relay's own view to diagnose (2026-07-18).
+        try:
+            with open(os.path.join(CONTENT, "operator_relay.log"), "a",
+                      encoding="utf-8") as f:
+                f.write(data)
+        except OSError:
+            pass
         for line in data.splitlines():
             if line.strip():
                 self.log.appendPlainText(line)