feat(rebuild): #56 human rebuild errors point at doctor

sys-update / sys-rebuild / home-update tee output and on failure print
the last 40 log lines plus nomarchy-doctor + RECOVERY.md. theme-sync HM
switch failure notify/die text matches. Close #56.

Verified: V1 (HM rebuild; failure-footer shell smoke).

agent/BACKLOG.md

@@ -63,20 +63,6 @@ Next slice: on hardware, run `hyprctl clients` while each is open, read
 the real `class`, then append rules. Also revisit whether blueman/s-c-p
 actually float once seen (regex tolerance for the `.…-wrapped` form).
 
-### 55. Fingerprint menu: enroll / list (+ optional PAM toggle)
-VISION § A / HARDWARE.md §5. Installer enables fprintd on known USB VIDs
-but enroll is CLI-only (`fprintd-enroll`) and PAM is a commented rebuild.
-Self-gated System row when `fprintd` is present: enroll, list, delete;
-optional “use for login” that writes `settings`/system intent + rebuild
-note (Control Center Bluetooth pattern). Full enroll path is
-`[blocked:hw]` / V3; menu surface + self-gate + dry paths are V1–V2.
-
-### 56. Human rebuild errors
-VISION § A. On failed `sys-rebuild` / HM switch, point the user at the
-last log lines + `nomarchy-doctor` instead of a raw Nix wall. Likely
-home: menu rebuild wrapper and/or control-center path. Cost: medium
-pkgs/menu; V1 + V2 smoke of the failure path (can force a bad eval).
-
 ## LATER
 
 - **Wallpapers artifact split** (ROADMAP § Faster switches — decided,
@@ -423,8 +409,9 @@ autodetect is strong; day-2 lifecycle (firmware, biometrics, re-detect,
 NVIDIA depth) is still mostly CLI. Items below are product work on top
 of that doc — design notes live there (§4–§10).*
 
-_(`nomarchy-detect-hw` CLI → **#58**; Fingerprint menu → **#55**;
-Installer NVIDIA commented guidance → **#59** ✓ 2026-07-10.)_
+_(`nomarchy-detect-hw` CLI → **#58** ✓ 2026-07-10; Fingerprint menu → **#55** ✓
+2026-07-10 (V3 enroll on reader); Installer NVIDIA commented guidance →
+**#59** ✓ 2026-07-10.)_
 
 _(hardware-db ∈ nixos-hardware → #49; usbutils on install PATH → #50;
 i2c README table → #48.)_