[Sync] replace the flat layout with the unified stow tree

Supersedes the old flat .config/ layout (last published 2026-06-28) with the
private repo's structure: one shared base plus per-host overlays.

- packages: common/ gui/ lw/ fl/ wm/ plus install.sh and bin/ tooling
  (dotsync, reconcile-hyde.sh)
- new README covering the layout, deploy order and the HyDE dependency
- current HyDE waybar rig (layouts/, cava), pi agent extensions, claude/
  config, tmux, presenterm, aichat roles
- fish: kp (keepassxc-cli + fzf picker, db path from $KP_DB) and
  bind_M_n_history (alt+1..9 recalls the nth history entry)
- drops cruft that should never have been tracked: the duplicate top-level
  .pi/ copy, btop.log, zellij config.kdl.bak, fish_variables
- .pi/agent/auth.json is gitignored; auth.json.example ships instead

Host-specific work sessions and the personal backlog stay in the private
tree. Endpoint locators in the llamacpp/whisper guides are placeholders
($SERVER, <own-domain>) — the guides themselves stay, since they are the
useful part.

wm/.config/hypr/nvidia.conf

@@ -0,0 +1,30 @@
+
+# █▄░█ █░█ █ █▀▄ █ ▄▀█
+# █░▀█ ▀▄▀ █ █▄▀ █ █▀█
+
+# Hyprland Nvidia Configuration
+# See https://wiki.hyprland.org/Nvidia/
+env = LIBVA_DRIVER_NAME,nvidia
+env = __GLX_VENDOR_LIBRARY_NAME,nvidia # Disable this if you have issues with screensharing
+
+
+# If you want to try hardware cursors,
+# you can enable them by setting `cursor:no_hardware_cursors = false` ,
+# but it will require also enabling `cursor:allow_dumb_copy`
+# which may cause small to major hitches whenever the cursor shape changes.
+# If this is a problem on your system, keep hardware cursors disabled.
+cursor:no_hardware_cursors = true # Set to true to avoid hitches
+# cursor:allow_dumb_copy = true
+
+# https://wiki.hyprland.org/Nvidia/#va-api-hardware-video-acceleration
+# Hardware video acceleration on Nvidia and Wayland is
+# possible with the nvidia-vaapi-driver.
+# This may solve specific issues in Electron apps.
+env = NVD_BACKEND,direct # Requires 'libva-nvidia-driver' package
+
+# https://wiki.hyprland.org/Nvidia/#regarding-environment-variables
+# If you encounter crashes in Firefox, remove this line
+env = GBM_BACKEND,nvidia-drm
+
+# If you have a multi-GPU setup and you are facing lag in external monitor.
+# See https://wiki.hyprland.org/Configuring/Multi-GPU/