Fix Void package lifecycle on host

src/fenris/init_system.py

@@ -319,16 +319,37 @@ def _runit_is_enabled() -> bool:
 def _runit_is_running() -> bool:
     """Check if the runit service is currently running.
 
-    Looks for a 'supervise/pid' file in the service directory.
+    Looks for a 'supervise/pid' file in the service directory.  Void creates
+    that directory root-only, so unprivileged dashboard reads fall back to
+    the public process table when they cannot traverse it.
     """
+    def runsv_process_exists() -> bool:
+        try:
+            result = subprocess.run(
+                ["pgrep", "-f", "^runsv fenris-collect$"],
+                capture_output=True,
+                text=True,
+                timeout=5,
+            )
+            return result.returncode == 0
+        except (FileNotFoundError, subprocess.TimeoutExpired, OSError):
+            return False
+
     pid_file = FENRIS_SV_DIR / "supervise" / "pid"
+    # On Void, Path.exists() is false for an unprivileged process when it
+    # cannot traverse runit's root-only supervise directory.
     if not pid_file.exists():
-        return False
+        return FENRIS_SERVICE_LINK.exists() and runsv_process_exists()
     try:
         pid = int(pid_file.read_text().strip())
         # Check if the process is alive
         os.kill(pid, 0)
         return True
+    except PermissionError:
+        # runsv's supervisor state is root-only on Void.  Its process command
+        # is still observable, which gives the read-only UI the same runtime
+        # fact without granting it service-control permissions.
+        return FENRIS_SERVICE_LINK.exists() and runsv_process_exists()
     except (ValueError, OSError):
         return False