docs: flip stale status markers across the tracks (audit found 23)

An all-tracks docs-vs-code audit (the same method that caught the storage
drift) found 23 confirmed inaccuracies where a doc's build-status claim no
longer matches the source — status markers that were never flipped after a
track landed, and a few paths left over from completed flag-days. All verified
against the code before editing; docs only, no behavior change.

The systemic ones:
- IOMMU enforcement (driver-model.md, drivers.md): docs said enforcement was
  not built and "device_claim = ring 0" / "memory-safe is not true yet". It is
  built (per-device VT-d/AMD-Vi domains programmed at device_claim, -ECONFINE
  rollback, dma_alloc buffers bound and torn down at death; fail-open only with
  no IOMMU). Restated; M16 marker flipped to done.
- The FHS flag-day paths: /etc/devices.csv -> /system/configuration/devices.csv
  (devices-csv.md, new-driver-checklist.md, device-manager.md), /var/log ->
  /system/logs (logging.md, new-driver-checklist.md), /mnt/usb -> /volumes/usb
  (process-management.md). Following the old paths silently breaks driver match.
- protocol-namespace P4 "remaining" -> landed (only P5 remains); shared-fate
  fan-out "not yet enforced" -> enforced; wall_clock "not built" -> built;
  SMP affinity + fault-recovery "left" -> built; process_enumerate raw-pointer
  trust model -> checked copyToUser/EFAULT; bounds.md maximum_devices static
  hole -> dynamic per-registrar quota; init spawns fat -> volume-manager;
  config "hardcoded, move to /etc" -> already CSV data files; vdso.md three-
  value call; zig-self-hosting library/ layout; python argv "new" -> built.

Found and fixed by a multi-agent audit across 12 doc clusters, each finding
adversarially verified against the source.

docs/device-driver-development/device-manager.md

@@ -136,7 +136,7 @@ xHCI match already uses); USB children carry the (class, subclass, protocol) tri
 from usb-ids.zig — each bus's native language, decoded by the shared ids modules.
 (Since the registry landed, `child_added` also carries a `bus` discriminator and
 the numeric `vendor`/`device`/`subsystem` ids the finer match levels need —
-see [/etc/devices.csv](devices-csv.md).)
+see [/system/configuration/devices.csv](devices-csv.md).)
 
 ## Supervision and restart
 
@@ -227,7 +227,7 @@ published exit events, signals + `process`). On top of those:
   class triple alone, so a virtio-gpu could only be matched as a generic display
   function and the driver had to re-confirm its `1AF4:1050` identity from config
   space after being spawned. The manifest the earlier note anticipated landed as a
-  human-readable registry: **[/etc/devices.csv](devices-csv.md)**, parsed by the
+  human-readable registry: **[/system/configuration/devices.csv](devices-csv.md)**, parsed by the
   pure `device-registry` module and read by the manager at boot. A row binds a
   driver to a device by any of base / subclass / prog-IF / vendor / device /
   subsystem / `_HID`, most-specific match winning; it is authoritative (no