chore(10-01): add Drizzle migration for pros/cons columns

- drizzle/0004_soft_synch.sql: ALTER TABLE thread_candidates ADD COLUMN pros/cons
- drizzle/meta/0004_snapshot.json: updated schema snapshot
- drizzle/meta/_journal.json: migration journal entry

drizzle/meta/_journal.json

@@ -29,6 +29,13 @@
       "when": 1773670263013,
       "tag": "0003_misty_mongu",
       "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "6",
+      "when": 1773693113029,
+      "tag": "0004_soft_synch",
+      "breakpoints": true
     }
   ]
 }