Add strict evidence service boundary

scripts/interpretation_source_inventory_gate.py

@@ -13,7 +13,7 @@ ROOT = Path(__file__).resolve().parents[1]
 if str(ROOT) not in sys.path:
     sys.path.insert(0, str(ROOT))
 
-from mcp_server import _existing_interpretation_source_pack  # noqa: E402
+from scripts.strict_evidence_service import existing_interpretation_source_pack  # noqa: E402
 
 
 REQUIRED_LAYERS = [
@@ -100,7 +100,7 @@ CANDIDATE_KEYWORDS = [
 
 
 def build_report() -> dict[str, Any]:
-    source_pack = _existing_interpretation_source_pack()
+    source_pack = existing_interpretation_source_pack()
     inventory = source_pack.get("interpretation_source_inventory") if isinstance(source_pack, dict) else {}
     if not isinstance(inventory, dict):
         inventory = {}

scripts/strict_evidence_service.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+"""Stable strict-evidence service boundary.
+
+This module is the import target for engine/API code. The current implementation
+delegates to the legacy MCP implementation while the large helper stack is being
+extracted out of `mcp_server.py`.
+"""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+from typing import Any
+
+ROOT = Path(__file__).resolve().parents[1]
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))
+
+
+def collect_strict_evidence(route: str, result: dict[str, Any]) -> dict[str, Any]:
+    from mcp_server import _collect_strict_evidence
+
+    return _collect_strict_evidence(route, result)
+
+
+def existing_interpretation_source_pack() -> dict[str, Any]:
+    from mcp_server import _existing_interpretation_source_pack
+
+    return _existing_interpretation_source_pack()