[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)

wm/.config/evremap/evremap.toml

@@ -0,0 +1,60 @@
+# The name of the device to remap.
+# Run `sudo evremap list-devices` to see the devices available
+# on your system.
+device_name = "Logitech USB Keyboard"
+
+# If you have multiple devices with the same name, you can optionally
+# specify the `phys` value that is printed by the `list-devices` subcommand
+# phys = "usb-0000:07:00.3-2.1.1/input0"
+
+# Configure CAPSLOCK as a Dual Role key.
+# Holding it produces LEFTCTRL, but tapping it
+# will produce ESC.
+# Both `tap` and `hold` can expand to multiple output keys.
+[[dual_role]]
+input = "KEY_CAPSLOCK"
+hold = ["KEY_LEFTCTRL"]
+tap = ["KEY_ESC"]
+
+# Turn RIGHT ALT into a vim-arrow layer.
+# We first neuter it: instead of ever emitting KEY_RIGHTALT (which apps treat
+# as "activate menu" on a bare tap), it becomes KEY_F13 -- a real keycode that
+# is unbound in every app, so tapping or holding right alt alone does nothing.
+# The chords below then turn F13 + h/j/k/l into the arrow keys.
+[[dual_role]]
+input = "KEY_RIGHTALT"
+hold = ["KEY_F13"]
+tap = ["KEY_F13"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_H"]
+output = ["KEY_LEFT"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_J"]
+output = ["KEY_DOWN"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_K"]
+output = ["KEY_UP"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_L"]
+output = ["KEY_RIGHT"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_U"]
+output = ["KEY_PAGEUP"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_D"]
+output = ["KEY_PAGEDOWN"]
+
+# Word-wise motion: emit Ctrl+Arrow so it jumps by word.
+[[remap]]
+input = ["KEY_F13", "KEY_B"]
+output = ["KEY_LEFTCTRL", "KEY_LEFT"]
+
+[[remap]]
+input = ["KEY_F13", "KEY_W"]
+output = ["KEY_LEFTCTRL", "KEY_RIGHT"]