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/os-development/bounds.md

@@ -89,14 +89,19 @@ comptime {
 }
 ```
 
-`maximum_domains = 64` and `maximum_devices = 64` agree today only by a sentence in a
-comment, and the agreement fails open. This is the clause with a live hole behind it,
-and the reason raising `maximum_devices` alone would be a privilege escalation rather
-than a fix.
+`maximum_domains = 64` and `maximum_devices = 64` once agreed only by a sentence in a
+comment, and that agreement failed open — the clause with the live hole behind it, where
+raising `maximum_devices` alone left every device id past the end of `iommu.confined`
+unconfined while `confineDevice` still reported success, a privilege escalation rather
+than a fix. The assert closed that: it held the two together while both stayed fixed, and
+when the device table was later made dynamic — no `maximum_devices` any more, only a
+per-registrar quota — that forced them apart, the assert having done its job. `confined`
+now grows to cover every id the broker mints, and `confineDevice` refuses when it cannot
+record a confinement rather than failing open.
 
 ## The worked bad case
 
-`devices_broker.maximum_devices`, which had no comment at all:
+`devices_broker.maximum_devices`, which had no comment at all, before it was made dynamic:
 
 ```zig
 /// bound: device nodes for the whole machine — firmware-discovered plus registered