[Sync] adopt unified stow layout from the private repo

Mirrors the private dots tree at 900bdda: one shared base plus per-host
overlays, replacing the old flat .config/ layout (last synced 2026-06-28).

- packages: common/ gui/ wm/ lw/ fl/ + install.sh and bin/ tooling (dotsync,
  reconcile-hyde.sh)
- new README (layout, deploy order, HyDE dependency), plus ToDo.md and
  HYDE-UPDATE.md
- current HyDE waybar rig (layouts/, cava), pi agent extensions, claude/
  config, tmux, presenterm, aichat roles
- drops stale duplicates and generated cruft that should never have been
  tracked: the second top-level .pi/ copy, btop.log, zellij config.kdl.bak,
  fish_variables, nvim codecompanion.lua
- .pi/agent/auth.json is gitignored now; auth.json.example ships instead
- fl/ and wm/ hypr themes/ stay untracked (HyDE-generated per machine, per
  the root .gitignore)

gui/.config/hypr/hypridle.conf

@@ -0,0 +1,50 @@
+#!      ░▒▒▒░░░▓▓           ___________
+#!    ░░▒▒▒░░░░░▓▓        //___________/
+#!   ░░▒▒▒░░░░░▓▓     _   _ _    _ _____
+#!   ░░▒▒░░░░░▓▓▓▓▓▓ | | | | |  | |  __/
+#!    ░▒▒░░░░▓▓   ▓▓ | |_| | |_/ /| |___
+#!     ░▒▒░░▓▓   ▓▓   \__  |____/ |____/
+#!       ░▒▓▓   ▓▓  //____/
+
+# $LOCKSCREEN = hyprlock # preferred LOCKSCREEN e.g swaylock
+$LOCKSCREEN = lockscreen.sh # Calls $LOCKSCREEN set from hyprland
+
+general {
+    lock_cmd = $LOCKSCREEN
+    unlock_cmd = #notify-send "unlock!"      # same as above, but unlock
+    before_sleep_cmd = $LOCKSCREEN    # command ran before sleep
+    after_sleep_cmd = # notify-send "Awake!"  # command ran after sleep
+    ignore_dbus_inhibit = 0
+}
+
+# Dims the display
+listener {
+    timeout = 120
+on-timeout = { brightnessctl -s && brightnessctl s 1% ;}
+    on-resume = brightnessctl -r
+}
+
+# Lock it first before dpms off so that screen won't show for a moment after wake up.
+listener {
+    timeout = 240
+    on-timeout = $LOCKSCREEN
+}
+
+# DPMS off
+listener {
+    timeout = 2300
+    on-timeout = hyprctl dispatch dpms off #do not turn off display while media is playing
+    on-resume = hyprctl dispatch dpms on
+}
+
+# Suspend
+# listener {
+#     timeout = 500
+#    on-timeout = systemctl suspend
+# }
+
+# hyprlang noerror true
+# Source anything  from this path if you want to add your own listener
+# source command actually do not exist yet
+source = ~/.config/hypridle/*
+# hyprlang noerror false