Split native Periscope (periscope/src) from inherited PinScope (periscope/dependency).

Keep validate.py and the finding engine as-is. AGPL LICENSE stays at the repo root.
Docker overlays dependency then src. Do not delete the inherited tree.

tests/test_eval_report.py

@@ -8,6 +8,8 @@ Unverified quotes are citation misses, not hits.
 
 from __future__ import annotations
 
+from tests.paths import SIMPLE_PROJECT, TAXONOMY
+
 from pathlib import Path
 
 from backend.periscopex.eval_report import (
@@ -80,7 +82,7 @@ def test_citation_rate_ignores_deterministic_and_counts_unverified():
 
 
 def test_simple_project_eval_matches_committed_golden():
-    root = Path(__file__).resolve().parents[1] / "simple_project"
+    root = SIMPLE_PROJECT
     scores = eval_simple_project(root)
     assert scores.graph_ok, scores.graph_errors
     assert scores.precision == 1.0
@@ -94,7 +96,7 @@ def test_simple_project_eval_rejects_truncated_graph(tmp_path: Path):
     import json
     import shutil
 
-    src = Path(__file__).resolve().parents[1] / "simple_project"
+    src = SIMPLE_PROJECT
     dest = tmp_path / "simple_project"
     shutil.copytree(src, dest)
     g = json.loads((dest / "design_graph.json").read_text())