[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/whisper/turbo.env

@@ -0,0 +1,6 @@
+# DEFAULT instance (port 11345) — the one Open WebUI points at.
+# Best accuracy, multilingual. Measured 2026-08-08: ~15.1 s per request, FLAT (whisper pads every
+# clip to a 30 s window, so a 3 s utterance costs the same as a 30 s one).
+WHISPER_MODEL=/home/anon/software/models/ggml-large-v3-turbo-q5_0.bin
+WHISPER_PORT=11345
+WHISPER_LANG=auto