test: add integration tests for capsule lifecycle, commands, files, and git

43 tests across 4 classes hitting the live API. Shared capsule per class
to minimize VM boot overhead. All capsules destroyed in teardown.
Skips automatically when WRENN_API_KEY is not available.

tests/conftest.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import os
+from pathlib import Path
+
+import pytest
+
+ENV_FILE = Path(__file__).resolve().parent.parent / ".env"
+
+
+def _read_env_file() -> dict[str, str]:
+    result: dict[str, str] = {}
+    if not ENV_FILE.exists():
+        return result
+    for line in ENV_FILE.read_text().splitlines():
+        line = line.strip()
+        if not line or line.startswith("#") or "=" not in line:
+            continue
+        key, _, value = line.partition("=")
+        key = key.strip()
+        value = value.strip().strip("\"'")
+        if key:
+            result[key] = value
+    return result
+
+
+def pytest_collection_modifyitems(config: pytest.Config, items: list[pytest.Item]) -> None:
+    env_vars = _read_env_file()
+    has_key = bool(os.environ.get("WRENN_API_KEY") or env_vars.get("WRENN_API_KEY"))
+    if has_key:
+        return
+    skip = pytest.mark.skip(reason="WRENN_API_KEY not set")
+    for item in items:
+        if "integration" in item.keywords:
+            item.add_marker(skip)