Native DeepSeek datasheet extraction in periscope/src (Fase C3).

Pipeline and LCSC resolve call datasheet_extract; inherited extraction.py
stays in dependency as fallback. No Anthropic Console skill ids.

tests/test_native_datasheet_extract.py

@@ -0,0 +1,31 @@
+"""Native datasheet_extract vs inherited extraction — prove before switching pipeline."""
+
+from __future__ import annotations
+
+import ast
+from pathlib import Path
+
+from backend.services.datasheet_extract import _coerce_abs_max
+from backend.services.extraction import _coerce_abs_max as inherited_coerce
+
+
+def test_coerce_abs_max_matches_inherited():
+    raw = [
+        {"parameter": "Vin", "min": 0, "max": 6, "unit": "V", "source_page": 4},
+        "not-a-dict",
+    ]
+    assert _coerce_abs_max(raw) == inherited_coerce(raw)
+    assert _coerce_abs_max(None) == inherited_coerce(None)
+
+
+def test_native_extract_has_no_anthropic_import():
+    path = Path(__import__("backend.services.datasheet_extract", fromlist=["x"]).__file__)
+    tree = ast.parse(path.read_text())
+    imported = []
+    for node in ast.walk(tree):
+        if isinstance(node, ast.ImportFrom) and node.module:
+            imported.append(node.module)
+        elif isinstance(node, ast.Import):
+            imported.extend(a.name for a in node.names)
+    assert not any("anthropic" in (m or "") for m in imported)
+    assert "backend.services.llm.factory" in imported