[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.

common/.config/claude/CLAUDE.md

@@ -0,0 +1,21 @@
+# Global user preferences (applies to every project)
+
+## Environment
+- Arch Linux, Wayland, fish shell, kitty terminal. Prefer fish-compatible syntax in shell snippets (not bash-isms) when writing things the user will run interactively. Clipboard is `wl-copy`.
+- Package manager: pacman / yay. Common abbrs: `pacs`, `yays`.
+
+## Local-first LLMs
+- The user self-hosts models on the LAN at `192.168.0.204`:
+  - llama.cpp server — `http://192.168.0.204:11343/v1` (OpenAI-compatible).
+  - Ollama — `192.168.0.204:11434`.
+- Recurring models: Qwen3-Coder-30B, gemma-4-26B, DeepSeek-Coder-V2-Lite, GLM-4.7-Flash. When configuring any AI/agent tool, default to these endpoints rather than a cloud API unless asked otherwise.
+
+## Git
+- **Do not run `git commit` or `git push`, and never offer or ask to do the committing/pushing yourself** — the user reviews and commits entirely manually (these are also denied in settings.json). Stage/prepare changes and stop there. You may suggest a commit message for the user to use, but nothing more.
+- To hand off a suggested commit message, write it to the per-worktree file `$(git rev-parse --git-path CLAUDE_COMMIT_MSG)` — **not** `COMMIT_EDITMSG` (git overwrites that on `git commit`). A `prepare-commit-msg` hook prefills the editor from it (one-shot) on the next `git commit` / lazygit `C`. Just the raw message, no `#` comments.
+
+## Formatting
+- Lua: format with `stylua` (2-space indent, 120 col, no call parentheses — see any `.stylua.toml`).
+
+## Dotfiles
+- Configs live in the dots repo under `.config/` and are surfaced via per-directory symlinks into `~/.config/` (and `~/.claude/`). Editing a file under the repo's `.config/` is editing the live config — no deploy step.