Initial commit: VMware vSphere API simulator scaffold.

Add the FastAPI app, PostgreSQL migrations, Docker/Helm packaging, API
contracts, docs, client examples, and the unit/integration/compatibility
test suite for local client and tooling labs without a real vCenter.

tests/unit/test_api_viewer_fixture.py

@@ -0,0 +1,25 @@
+"""Offline checks for the researched API Viewer sample."""
+
+import hashlib
+import json
+from pathlib import Path
+from typing import Any, cast
+
+import pytest
+
+pytestmark = pytest.mark.pve_stub
+
+FIXTURES = Path(__file__).parents[1] / "fixtures" / "api-viewer"
+
+
+def test_version_fixture_matches_provenance() -> None:
+    fixture_path = FIXTURES / "pve-9.2.3-version.json"
+    provenance_path = FIXTURES / "pve-9.2.3-version.provenance.json"
+
+    fixture_bytes = fixture_path.read_bytes()
+    fixture = cast(dict[str, Any], json.loads(fixture_bytes))
+    provenance = cast(dict[str, Any], json.loads(provenance_path.read_bytes()))
+
+    assert fixture["path"] == "/version"
+    assert fixture["info"]["GET"]["method"] == "GET"
+    assert hashlib.sha256(fixture_bytes).hexdigest() == provenance["fixture_sha256"]