[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.

fl/.config/whisper/small.env

@@ -0,0 +1,6 @@
+# FAST instance (port 11346) — English-only, ~5x lighter than turbo.
+# Same API; point a client at :11346 instead of :11345 when latency matters more than accuracy.
+# For a multilingual equivalent use ggml-small-q5_1.bin and set WHISPER_LANG=auto.
+WHISPER_MODEL=/home/anon/software/models/ggml-small.en-q5_1.bin
+WHISPER_PORT=11346
+WHISPER_LANG=en