fix: send explicit User-Agent (Cloudflare 403s default Python-urllib UA at id.shre.ai)

Co-Authored-By: Claude Fable 5 <[email protected]>

client/granthi_sync_client.py

@@ -64,6 +64,8 @@ def http_json(method, url, headers=None, body=None, form=None, timeout=30):
     """Returns (status, parsed-json-or-{'raw': text})."""
     data = None
     hdrs = dict(headers or {})
+    # Cloudflare in front of id.shre.ai 403s the default Python-urllib UA.
+    hdrs.setdefault("User-Agent", f"granthi-sync/{VERSION}")
     if form is not None:
         data = urllib.parse.urlencode(form).encode()
         hdrs.setdefault("Content-Type", "application/x-www-form-urlencoded")