docs(power): reclaim the sleep docs from the sold box; fix AGENTS.md machine facts

The sleep/wake saga (Alienware-M16a2 research + Sleep-Fix-Guide) framed a
machine sold on 2026-09-28 as 'this system' — the 2026-09-28 identifier
purge missed both because they name no hostname. blankpad probed live:
Lenovo, AMD Ryzen 5 PRO 5650U / Cezanne, unified memory, s2idle only,
no NVIDIA, no ~/GitPackages/llama.cpp.

- research/Sleep-Fix-Guide.md -> .AGENTTRASH (verbatim restatement of the
  research doc's fix steps; PowerCluster overlap census)
- Alienware doc: archive banner, 'this system' -> retired dankware
- linux-power-management.md: scope note (blankpad s2idle-only; NVIDIA
  section is dankware/future-NVIDIA territory), boilerplate AGENTS.md
  cross-ref dropped
- cachyos.md: de-pinned rolling-release kernel versions (7.1.4 doc vs
  7.2.9 live), repo list confirmed verbatim against pacman.conf, SDDM
  confirmed live, verified: 2026-10-19
- AGENTS.md: dev-workstation row rewritten for blankpad; Gitea gotcha
  corrected — remote URLs carry NO token (credential-store file, verified)

Refs #29

omp-docs/research/Alienware-M16a2-Linux-sleep-wake-issues.md

@@ -1,7 +1,7 @@
 ---
 type: reference
 title: Alienware M16a2 Linux Sleep/Wake Issues
-description: Comprehensive research on NVIDIA GPU driver state corruption during suspend/resume on Alienware M16a2 with Linux.
+description: "Sleep/wake research on the Alienware m16 R2 (dankware, sold 2026-09-28): NVIDIA driver state corruption during suspend/resume on Dell hardware. Kept as class-level Dell/Alienware + NVIDIA knowledge."
 tags:
   - research
   - sleep-wake
@@ -12,6 +12,13 @@ timestamp: 2026-01-15
 
 # Alienware M16a2 Linux Sleep/Wake Issues — Comprehensive Research
 
+> **Machine archive (2026-10-19).** "This system" throughout is **dankware**,
+> the Alienware m16 R2 client workstation sold 2026-09-28 (see `log.md`). The
+> current dev workstation (`blankpad` — AMD Ryzen 5 PRO 5650U / Cezanne APU,
+> s2idle only, no NVIDIA GPU) is not this machine. Hardware inventory and
+> driver versions are historical; the class-level Dell/Alienware + NVIDIA
+> suspend research is retained as durable knowledge.
+
 ## Executive Summary
 
 The symptom — **screen stays black after waking from sleep (lid close)** — is a well-documented class of issues on Dell/Alienware laptops with NVIDIA GPUs running Linux. The root cause is almost always **NVIDIA GPU driver state corruption during suspend/resume**, compounded by ACPI/sleep state selection issues and BIOS/firmware settings.
@@ -21,7 +28,7 @@ The symptom — **screen stays black after waking from sleep (lid close)** — i
 ## 1. Known Issues with Alienware M16a2 + Linux Sleep States
 
 ### 1.1 Model Context
-The Alienware m16 R2 (this system) is equipped with:
+The Alienware m16 R2 (the retired **dankware** box) is equipped with:
 - **Intel Core Ultra 7 155H** (Meteor Lake, 6p+8e cores, 22 threads)
 - **Intel Arc Graphics** (Meteor Lake-P iGPU)
 - **NVIDIA GeForce RTX 4070 Laptop GPU** (AD106M, Max-Q/Mobile)