Add initial web editor app, CLI scripts, and test scaffolding.

This introduces the FastAPI editor implementation and related project setup so the app can be run and validated locally.

Made-with: Cursor

tests/test_completion_api.py

@@ -0,0 +1,36 @@
+import importlib
+import os
+import sys
+from pathlib import Path
+
+from fastapi.testclient import TestClient
+
+
+def test_python_completion_returns_basic_suggestions(tmp_path):
+    editor_dir = Path(__file__).resolve().parents[1]
+    src_dir = editor_dir / "src"
+    if str(src_dir) not in sys.path:
+        sys.path.insert(0, str(src_dir))
+
+    os.environ["WORKSPACE_ROOT"] = str(tmp_path)
+    import app as editor_app
+
+    editor_app = importlib.reload(editor_app)
+    editor_app.WORKSPACE_ROOT = tmp_path
+    client = TestClient(editor_app.app)
+
+    response = client.post(
+        "/api/python/completions",
+        json={
+            "file_path": "example.py",
+            "content": "import os\nos.pa",
+            "line": 2,
+            "column": 5,
+            "max_results": 20,
+        },
+    )
+
+    assert response.status_code == 200
+    body = response.json()
+    names = [item["name"] for item in body["completions"]]
+    assert "path" in names