Rewrite Next.js local BFF routes and mock catalog.

Projects, report, and graph JSON handlers overlay from periscope/src. Clerk proxy stays the inherited open-core seam.

tests/test_periscope_frontend_bff_rewrite.py

@@ -0,0 +1,58 @@
+"""Next.js BFF routes for local JSON live under periscope/src."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+SRC = ROOT / "periscope" / "src" / "frontend" / "src"
+
+
+def _text(rel: str) -> str:
+    path = SRC / rel
+    assert path.is_file(), rel
+    return path.read_text(encoding="utf-8")
+
+
+def test_bff_routes_are_src():
+    for rel in (
+        "lib/mock-data.ts",
+        "app/(app)/api/_project-json.ts",
+        "app/(app)/api/projects/route.ts",
+        "app/(app)/api/report/[id]/route.ts",
+        "app/(app)/api/graph/[id]/route.ts",
+    ):
+        head = _text(rel)[:400]
+        assert "Native Periscope overlay" not in head
+
+
+def test_projects_route_serves_mock_catalog():
+    route = _text("app/(app)/api/projects/route.ts")
+    assert "export async function GET" in route
+    assert "PROJECTS" in route
+    mock = _text("lib/mock-data.ts")
+    assert "export const PROJECTS" in mock
+    assert "simple_project" in mock
+    assert "export function createPipelineSteps" in mock
+
+
+def test_report_and_graph_read_sibling_json():
+    report = _text("app/(app)/api/report/[id]/route.ts")
+    graph = _text("app/(app)/api/graph/[id]/route.ts")
+    helper = _text("app/(app)/api/_project-json.ts")
+    assert "report.json" in report
+    assert "Report not found" in report
+    assert "design_graph.json" in graph
+    assert "Graph not found" in graph
+    assert "jsonFromProjectFile" in helper
+    assert "params: Promise<{ id: string }>" in report
+    assert "params: Promise<{ id: string }>" in graph
+
+
+def test_proxy_stays_clerk_seam_in_dependency():
+    src_proxy = ROOT / "periscope" / "src" / "frontend" / "src" / "proxy.ts"
+    dep_proxy = ROOT / "periscope" / "dependency" / "frontend" / "src" / "proxy.ts"
+    assert not src_proxy.exists()
+    text = dep_proxy.read_text(encoding="utf-8")
+    assert "Open-core seam" in text
+    assert "export function proxy" in text