Stamp 2.59.0 Docker leftover seams only, not PinScope product.

Images copy periscope/src, vendor/, and skipped Clerk/shadcn/billing/GCS
files. dependency/ stays in git. Audit written; FastAPI boots with
PYTHONPATH=src.

tests/test_periscope_leftover_package_requirements.py

@@ -17,7 +17,7 @@ DOCKERIGNORE = ROOT / ".dockerignore"
 def test_package_json_is_periscope_web():
     text = PKG.read_text(encoding="utf-8")
     assert '"name": "periscope-web"' in text
-    assert '"version": "2.58.0"' in text
+    assert '"version": "2.59.0"' in text
     assert "Native Periscope overlay" not in text[:400]
     assert LOCK.is_file()
     lock = LOCK.read_text(encoding="utf-8")
@@ -45,6 +45,7 @@ def test_docker_installs_from_src():
     assert "COPY periscope/src/frontend/package.json" in fe
     assert "periscope/src/frontend/package-lock.json" in fe
     assert "COPY periscope/src/backend/requirements*.txt" in be
+    assert "COPY periscope/dependency/backend/ /app/backend/" not in be
     ignore = DOCKERIGNORE.read_text(encoding="utf-8")
     assert "faradworks-logo-white.png" in ignore
     assert "power-tree.gif" in ignore