[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/fish/host.fish

@@ -0,0 +1,22 @@
+## wm (desktop workstation, 4K, NVIDIA) — Wingman work machine
+
+# NVIDIA VA-API (hardware video acceleration)
+set -gx LIBVA_DRIVER_NAME nvidia
+
+# Toys built from local clones (only on this box)
+alias matrix="~/projects/random-clones/matrix/matrix"
+
+# Local llama.cpp
+abbr llamacpp "~/projects/random-clones/llama.cpp/build/bin/llama-server --alias Qwen3-Coder-30B-Instruct-XXS --jinja --ctx-size 8192 --temp 1.0 --top-p 0.95 --min-p 0.01 --port 11343 -m ~/Documents/models/Qwen3-Coder-30B-A3B-Instruct-UD-IQ2_XXS.gguf"
+
+# Wingman work (paths only exist on this box)
+alias tilesrv="cd /home/coja/software/wmclient/ && ./martin ./mapfiles/data -W 4 --font ./mapfiles/fonts"
+alias blocks="~/Documents/Blocks/LinuxNoEditor/Blocks.sh -windowed -RenderOffscreen"
+alias cur="cd ~/projects/wingman/wm-clients/c2/c2-main"
+alias c2m="cd ~/projects/wingman/wm-clients/c2/c2-main"
+alias c2mw="cd ~/projects/wingman/wm-clients/c2/c2-main/.worktrees/"
+alias c2b="cd ~/projects/wingman/wm-clients/c2/c2-building"
+
+# Notes live under ~/sync/notes on this box, not ~/sync/PersonalNotes — re-abbr todo
+# (host.fish is sourced after config.fish, so this wins over common's definition).
+abbr todo "cd ~/sync/notes/wm-client/ && nvim todo.md"