mars: drop idle-timeout on the /mnt/jupiter cifs mount

podman-hermes-agent.service RequiresMountsFor /mnt/jupiter, but the mount
option copied from terra's (read-only, nothing depends on it) browsing
mount included x-systemd.idle-timeout=60 — confirmed on real hardware,
this killed the container ~60-70s after every start with no crash or
error, just an idle auto-unmount taking the dependent service down with
it. Keep the lazy x-systemd.automount (so boot doesn't stall if jupiter's
down) but drop the timeout now that something needs the mount to persist.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011FHr5ug9pu8q4XPrRkFnzJ

hosts/mars/configuration.nix

@@ -38,8 +38,12 @@
       "file_mode=0770"
       "dir_mode=0770"
       "nofail"
-      "x-systemd.automount"
-      "x-systemd.idle-timeout=60"
+      "x-systemd.automount"    # lazy-mount so boot doesn't stall if jupiter's down
+      # NO idle-timeout here (unlike terra's equivalent mount): hermes-agent's
+      # podman-hermes-agent.service RequiresMountsFor this path, so an idle
+      # auto-unmount tears the container down with it — confirmed the hard
+      # way, it killed the service ~60-70s after every start with no crash
+      # or error, just "Unmounting /mnt/jupiter" right before the stop.
       "x-systemd.mount-timeout=10s"
       "_netdev"
     ];