rsnix: runtime device detection — rescan for hotplugged/removed disks

Phase 1: make the boot discovery pipeline re-runnable and diff it
against live hardware state.

- ahci: store ABAR/NP/port bitmap; poll_dirty() (cheap PxSSTS.DET check
  per port) and rescan() which starts newly-present ports and tombstones
  the slots of removed ones.  Slots never shift, so disk indices stay
  valid.  select() now rejects tombstoned slots.
- fat: Volume gets a mounted flag; rescan() unmounts volumes whose disk
  left and mounts every disk without a mounted volume (re-trying failed
  boot mounts).  UID dedup ignores tombstones so a re-plugged disk keeps
  its /disk/<UID> name.
- fs: init's mount loop factored into rescan_disks(), which lazily
  creates /disk, ensures a mount node per mounted volume and tombstones
  nodes of unmounted ones.
- shell: 'rescan' command + automatic deep rescan before each prompt
  when ahci::poll_dirty() sees a port-presence change.

Rescan events flow through serial_println so they land in klog too.
Removal (PxSSTS) is a real-hardware path: QEMU q35 rejects disk hotplug
on the ich9-ahci IDE buses, and PCIe device_del is a guest-cooperative
protocol this kernel does not implement.

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