feat: live charge limit, identity retunes, btop assets (product calls)

- Charge limit: udev GROUP=users on threshold; menu applies sysfs live
  and persists state; boot/AC oneshot prefers live theme-state.json.
- Look & Feel: Reset wallpaper (auto); Theme/next/night light already there.
- NVIDIA first-class wrappers deferred past v1 (keep #59 comments).
- Identity taste: white, lumon, hackerman, matte-black, miasma.
- Hand btop.theme for identity + boreal/executive-slate/neon-glass.

Verified: V0 contrast; V1 battery-charge-limit VM. V3 live sysfs on laptop.

docs/HARDWARE.md

@@ -237,18 +237,19 @@ force-load every GPU driver (avoids multi-driver panics). Proprietary
 NVIDIA on the live session is not the product focus; installed systems
 use the profile.
 
-**Product direction (shipped #59):** when `common-gpu-nvidia` is in
-`hardwareProfile`, the installer emits a **commented** `system.nix` block
-with PRIME / power / open-module pointers (same pattern as ROCm / NPU
-comments). A full `nomarchy.hardware.nvidia.*` stack stays optional and
-needs a maintainer + hardware-queue coverage.
+**Product direction (shipped #59; first-class wrappers deferred for v1):**
+when `common-gpu-nvidia` is in `hardwareProfile`, the installer emits a
+**commented** `system.nix` block with PRIME / power / open-module pointers
+(same pattern as ROCm / NPU comments). No `nomarchy.hardware.nvidia.*`
+stack for v1 — hybrid PRIME remains wiki/plain NixOS until a maintainer
+commits to hardware testing.
 
 ## 7. Day-2: “my laptop is mostly fine, make it fully fine”
 
 | Goal | How | Rebuild? |
 |------|-----|----------|
 | Power profile (perf/balanced/saver) | System menu / Waybar | No (PPD D-Bus) |
-| Charge limit 80% | Menu / `settings.power.batteryChargeLimit` | System (sysfs apply is separate backlog) |
+| Charge limit 80% | Menu / CC — live sysfs + state; boot oneshot re-applies | No rebuild for live; rebuild bakes Nix option |
 | Thermald (Intel) | Installer on for Intel laptops; else `power.thermal.enable` | System |
 | Fingerprint enroll | `fprintd-enroll` | No |
 | Fingerprint login | `fingerprint.pam = true` | System |