fix: resume lookback from progress file — don't reset to 2d when queue is non-empty

data/search_progress.json

@@ -0,0 +1,7 @@
+{
+  "lookback_days": 90,
+  "started_at": 1741220400000,
+  "completed": ["linkedin:Founding GTM"],
+  "pending": ["linkedin:Enterprise AE", "wellfound:Founding GTM"],
+  "stats:linkedin:Founding GTM": { "found": 913, "added": 814, "completed_at": 1741224000000 }
+}

data/searcher_last_run.json

@@ -0,0 +1,9 @@
+{
+  "started_at": 1772757505890,
+  "finished_at": null,
+  "finished": false,
+  "added": 40,
+  "seen": 146,
+  "skipped_dupes": 106,
+  "platforms": []
+}