feat(propose-adjudicate-prove): overlay adjudicates inventory before prove

Regex inventory stays the proposer. MAP attaches promote/demote/unadjudicated/coverage
from intra-file taint (tree-sitter when a grammar parses, Python ast as last resort).
Deep sandboxes promotions only, ordered by the existing heuristic ranker plus optional
OpenRouter mechanism recall. The SAST pair slice scores overlay outcomes; the stage-1
detection gate and local pair gate stay inventory-only.

src/openultrasast/semantic/prove_budget.py

@@ -0,0 +1,12 @@
+"""Prove-budget ranker: heuristic order plus optional mechanism recall."""
+
+from .mechanisms import MechanismStore, append_mechanism, order_promotions
+from .prove_filter import filter_promoted_hotspots, promoted_findings
+
+__all__ = [
+    "MechanismStore",
+    "append_mechanism",
+    "filter_promoted_hotspots",
+    "order_promotions",
+    "promoted_findings",
+]