Implement document reconciliation v2

scripts/apply_migrations.py

@@ -39,7 +39,8 @@ def main() -> int:
     parser.add_argument("--dry-run", action="store_true", help="List pending migrations without applying them.")
     args = parser.parse_args()
 
-    files = sorted(MIGRATIONS_DIR.glob("*.sql"))
+    # Down migrations are operator-invoked rollback artefacts, never pending ups.
+    files = sorted(path for path in MIGRATIONS_DIR.glob("*.sql") if not path.stem.endswith("_down"))
     if not files:
         print("No migrations found.")
         return 0
@@ -69,6 +70,14 @@ def main() -> int:
             return 0
 
         for version, path in pending:
+            if version == "007":
+                from scripts.preflight_document_reconciliation_v2 import run_preflight
+                diagnostics = run_preflight(conn)
+                if diagnostics["blockers"]:
+                    print("Migration 007 preflight failed:")
+                    for blocker in diagnostics["blockers"]:
+                        print(f"- {blocker}")
+                    return 2
             sql = path.read_text()
             print(f"Applying {path.name}...")
             conn.execute(text(sql))