Add assess_inventory_worktree_report verifier to reject partial PR inventory
claims, exactly-full first pages without finality proof, legacy scratch-worktree
flags that contradict branches/ review worktrees, and contradictory checkout
wording. Wire into build_final_report and export from review_proofs.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
