Pinscope open-source core

Agentic schematic validation: datasheet extraction via Claude Console
Skills, netlist/BOM design graph, per-IC direct datasheet review with
page citations, capacitor derating, Next.js report UI.

Extracted from the Pinscope cloud codebase. Auth and billing live in the
private gateway repo behind stable seams (billing_hook.py, adapter files
listed in CLAUDE.md).

tests/conftest.py

@@ -0,0 +1,41 @@
+"""Shared pytest fixtures — temp-dir storage backend + clean import path."""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+import pytest
+
+# Ensure the repo root is on sys.path so `import backend.*` works whether
+# pytest is invoked from the repo root or a subdirectory.
+REPO_ROOT = Path(__file__).resolve().parents[1]
+if str(REPO_ROOT) not in sys.path:
+    sys.path.insert(0, str(REPO_ROOT))
+
+
+@pytest.fixture(autouse=True)
+def _disable_llm_post_passes(monkeypatch):
+    """Keep the LLM normalize + cross-IC dedup passes off by default in tests.
+
+    Both ``normalize_findings_async`` and ``dedupe_cross_ic_findings_async``
+    import ``call_with_fallback`` into their own module namespace, so a test
+    that does ``monkeypatch.setattr(validation, "call_with_fallback", fake)``
+    does NOT intercept them — they would reach the real provider and make a
+    live API call mid-test. The dedicated unit tests exercise these passes via
+    their pure builder functions (``_build_normalized`` / ``_build_deduped``)
+    directly, so nothing needs them enabled through ``validate_design_async``.
+    A test that genuinely wants them on can re-enable with its own
+    ``monkeypatch.setattr`` (which runs after this autouse fixture)."""
+    from backend.config import settings
+
+    monkeypatch.setattr(settings, "normalize_findings_enabled", False, raising=False)
+    monkeypatch.setattr(settings, "cross_ic_dedup_enabled", False, raising=False)
+
+
+@pytest.fixture
+def storage(tmp_path):
+    """Return a LocalStorageBackend rooted at a fresh temp directory."""
+    from backend.services.storage import LocalStorageBackend
+
+    return LocalStorageBackend(tmp_path)