fix: third pass — purge stale oberon refs, add governor crash bug, remove AI filler

- Replace oberon-governor with cyan-skillfish-governor-tt as default across
  bazzite, debian, arch, cachyos, fedora, power, quick-reference, display,
  performance, radv, and stability pages (oberon remains documented as legacy)
- Add "Black Screen on GPU Reset (Governor Running)" section to
  troubleshooting/stability.md (source: Discord user nohanmv, Feb 26)
- Remove AI filler: "comprehensive" from index/sensors, unverifiable stats
  (3500+ members, 100+ solutions, 30+ games, 9716/7000+ messages analyzed,
  90%/95% success rates)
- Remove unverifiable 8K @60Hz display claim
- Update governor config examples from oberon YAML format to
  cyan-skillfish-governor-tt TOML format
- Normalize community links to point to filippor/cyan-skillfish-governor

docs/drivers/radv.md

@@ -733,7 +733,7 @@ cat /sys/class/drm/card0/device/pp_dpm_sclk
 # 2: 2000Mhz
 
 # If stuck at 1500MHz, governor is not working
-systemctl status oberon-governor
+systemctl status cyan-skillfish-governor-tt
 ```
 
 **Solution:** Install and configure GPU governor (see [System Configuration](../system/governor.md) guide).
@@ -756,5 +756,5 @@ For most users, install Mesa 25.1+ from your distribution's repositories, set `R
 ---
 
 **Last Updated:** 2026-03-18
-**Based on:** Discord community discussions (7,000+ messages analyzed)
+**Based on:** Discord community discussions
 **See Also:** [Linux Setup Guide](../linux/distributions.md), [System Configuration](../system/governor.md), [Gaming & Performance](../gaming/compatibility.md)