Extract hypr-sticky-hdr into standalone repo

[tyvsmith]

Summary

hypr-sticky-hdr solves a common Hyprland + HDR gaming problem (flickering on alt-tab) and would benefit from being a standalone open-source project rather than buried in dotfiles.

What it does

• Daemon that auto-detects HDR game windows via process env vars (PROTON_ENABLE_HDR=1, HYPR_STICKY_HDR=1)
• Keeps monitor in HDR mode for the game's entire lifetime, preventing alt-tab flicker
• Disables Hyprland's cm_auto_hdr while managing HDR to prevent conflicts
• Manual on/off override, desktop notifications on switch
• Event-driven via Hyprland IPC with debounced scanning and PID caching

TODO

• Create hypr-sticky-hdr repo
• Add README with usage, configuration, and Steam launch options
• Add install script / Makefile
• Submit to AUR
• Replace dotfiles copy with package reference