fix: auto-repair jobs.json with invalid control characters (#3537)

load_jobs() uses strict json.load() which rejects bare control characters
(e.g. literal newlines) in JSON string values. When a cron job prompt
contains such characters, the parser throws JSONDecodeError and the
function silently returns an empty list — causing ALL scheduled jobs
to stop firing with no error logged.

Fix: on JSONDecodeError, retry with json.loads(strict=False). If jobs
are recovered, auto-rewrite the file with proper escaping via save_jobs()
and log a warning. Only fall back to empty list if the JSON is truly
unrecoverable.

Co-authored-by: Sebastian Bochna <sbochna@SB-MBP-M2-2.local>

cron/jobs.py

@@ -327,7 +327,20 @@ def load_jobs() -> List[Dict[str, Any]]:
         with open(JOBS_FILE, 'r', encoding='utf-8') as f:
             data = json.load(f)
             return data.get("jobs", [])
-    except (json.JSONDecodeError, IOError):
+    except json.JSONDecodeError:
+        # Retry with strict=False to handle bare control chars in string values
+        try:
+            with open(JOBS_FILE, 'r', encoding='utf-8') as f:
+                data = json.loads(f.read(), strict=False)
+                jobs = data.get("jobs", [])
+                if jobs:
+                    # Auto-repair: rewrite with proper escaping
+                    save_jobs(jobs)
+                    logger.warning("Auto-repaired jobs.json (had invalid control characters)")
+                return jobs
+        except Exception:
+            return []
+    except IOError:
         return []