Fix SIGHUP reload tight-loop in watch mode (#702)

* Initial plan

* Fix _reload_requested tight-loop: reset flag before reload to capture concurrent SIGHUPs

Co-authored-by: seanthegeek <44679+seanthegeek@users.noreply.github.com>
Agent-Logs-Url: https://github.com/domainaware/parsedmarc/sessions/879d0bb1-9037-41f7-bc89-f59611956d2e

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: seanthegeek <44679+seanthegeek@users.noreply.github.com>

parsedmarc/cli.py

@@ -2027,7 +2027,10 @@ def _main():
             if not _reload_requested:
                 break
 
-            # Reload configuration
+            # Reload configuration — clear the flag first so that any new
+            # SIGHUP arriving while we reload will be captured for the next
+            # iteration rather than being silently dropped.
+            _reload_requested = False
             logger.info("Reloading configuration...")
             try:
                 # Build a fresh opts starting from CLI-only defaults so that