feat(api): Codex: add /health endpoint with podman + systemd checks

control/app.py

@@ -52,6 +52,36 @@ def _run_systemctl_action(action: str, unit: str):
     cmd = ["systemctl", "--user", action, unit]
     return _systemctl(cmd)
 
+@app.get("/health")
+def health():
+    podman_ok = False
+    try:
+        r = SESSION.get(f"{PODMAN_API_BASE}/libpod/info", timeout=2)
+        if r.status_code == 200:
+            try:
+                r.json()
+                podman_ok = True
+            except Exception:
+                podman_ok = False
+    except Exception:
+        podman_ok = False
+
+    systemd_reachable = False
+    try:
+        res = subprocess.run(
+            ["systemctl", "--user", "list-units", "--no-pager", "--no-legend"],
+            capture_output=True,
+            text=True,
+            check=False,
+            timeout=2,
+        )
+        systemd_reachable = (res.returncode == 0)
+    except Exception:
+        systemd_reachable = False
+
+    ok = podman_ok and systemd_reachable
+    return {"ok": ok, "podman": {"ok": podman_ok}, "systemd_user": {"reachable": systemd_reachable}}
+
 
 # --- MODELS ---
 class FileContent(BaseModel):