- pist_prove_and_classify.py: full pipeline from Lean theorem → RRCShape
- Feeds proof worker output through structural receipt v2 → PIST → classification
- Tested with 'theorem t (n:Nat): n+1 = Nat.succ n := by rfl' on 361395-1 worker
- Receipt v2 format with parsed operators, variables, AST metrics, proof metrics
