[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.

gui/.config/alacritty/theme.toml

@@ -0,0 +1,33 @@
+# Synthwave '84 — matches ../kitty/theme.conf
+
+[colors.primary]
+background = "#262335"
+foreground = "#ffffff"
+
+[colors.cursor]
+text = "#262335"
+cursor = "#f97e72"
+
+[colors.selection]
+text = "#262335"
+background = "#f97e72"
+
+[colors.normal]
+black = "#232530"
+red = "#fe4450"
+green = "#72f1b8"
+yellow = "#ff7edb"
+blue = "#03edf9"
+magenta = "#fede5d"
+cyan = "#03edf9"
+white = "#ffffff"
+
+[colors.bright]
+black = "#232530"
+red = "#fe4450"
+green = "#72f1b8"
+yellow = "#ff7edb"
+blue = "#03edf9"
+magenta = "#f3e70f"
+cyan = "#03edf9"
+white = "#ffffff"