[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/kitty/theme.conf

@@ -0,0 +1,61 @@
+
+# The basic colors
+foreground              #ffffff
+background              #262335
+selection_foreground    #262335
+selection_background    #f97e72
+
+# Cursor colors
+cursor                  #f97e72
+cursor_text_color       #262335
+
+# URL underline color when hovering with mouse
+url_color               #f97e72
+
+# OS Window titlebar colors
+wayland_titlebar_color system
+macos_titlebar_color system
+
+# Colors for marks (marked text in the terminal)
+mark1_foreground #262335
+mark1_background #614D85
+mark2_foreground #262335
+mark2_background #614D85
+mark3_foreground #262335
+mark3_background #614D85
+
+# The 16 terminal colors
+
+# black
+color0 #232530
+# bright-black = dim/secondary text (menus, comments); was #232530 ≈ background so it
+# rendered invisible. Lifted to the theme's muted lavender for legible dim text.
+color8 #848bbd
+
+# red
+color1 #fe4450
+color9 #fe4450
+
+# green
+color2  #72f1b8
+color10 #72f1b8
+
+# yellow
+color3  #ff7edb
+color11 #ff7edb
+
+# blue
+color4  #03edf9
+color12 #03edf9
+
+# magenta
+color5  #fede5d
+color13 #f3e70f
+
+# cyan
+color6  #03edf9
+color14 #03edf9
+
+# white
+color7  #ffffff
+color15 #ffffff