[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)

fl/.config/evremap/evremap.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Evremap Service
+After=multi-user.target
+
+[Service]
+WorkingDirectory=/
+# Config path must stay absolute: this is a system unit running as root, so ~ or $HOME would resolve to /root.
+ExecStart=bash -c "/usr/bin/evremap remap /home/anon/.config/evremap/evremap.toml -d 0"
+Restart=always
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target