Add the status checklist and workflow to the M17-M18 plan

docs/m17-m18-plan.md

@@ -21,6 +21,25 @@ run the existing QEMU suite green before any new work starts.
 
 **Numbering note:** continues the milestone sequence (driver track ended at M16).
 
+## Status
+
+The loop marks a phase `[x]` in the same commit that lands it. A phase is marked
+only when its definition of green holds.
+
+- [ ] **Phase 0** — baseline: docs committed ✓, feat/usb merged to main ✓, pushed ✓;
+      remaining: rename `usb-xhci-libary.zig` → `usb-xhci-library.zig` (naming
+      typo, empty file), run the existing QEMU suite green from the worktree.
+- [ ] **M17.1** — kernel releases claims/MSI on death (branch `feat/process-lifecycle`)
+- [ ] **M17.2** — exit reasons
+- [ ] **M17.3** — published exit events + VFS subscriber
+- [ ] **M17.4** — signals, timer notifications, `runtime.process`, the service harness
+- [ ] **merge** `feat/process-lifecycle` → main, push
+- [ ] **M18.1** — device-manager protocol: hello + restart policy (branch `feat/device-manager`)
+- [ ] **merge** `feat/device-manager` → main, push
+- [ ] **M18.2** — xHCI port scan + tree reports (branch `feat/usb-xhci-bus`)
+- [ ] **M18.3** — app surface: enumerate/subscribe + device-list
+- [ ] **merge** `feat/usb-xhci-bus` → main, push — **loop ends here**
+
 ---
 
 ## M17.1 — the kernel releases a dead process's claims