[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)

common/.inputrc

@@ -0,0 +1,47 @@
+# Vi mode
+set editing-mode vi
+set show-mode-in-prompt on
+set vi-ins-mode-string "\1\e[32m\2[I] \1\e[0m\2"
+set vi-cmd-mode-string "\1\e[31m\2[N] \1\e[0m\2"
+
+# exclude .files
+set match-hidden-files off
+
+set show-all-if-ambiguous on
+set show-all-if-unmodified on
+set colored-stats on
+set colored-completion-prefix on
+set mark-symlinked-directories on
+set completion-ignore-case on
+
+# Ignore duplicates in history where supported
+set skip-completed-text on
+
+# ----- insert mode: keep the emacs-style defaults -----
+# (no \e-prefixed binds here — they would delay ESC switching to normal mode)
+set keymap vi-insert
+"\C-a": beginning-of-line
+"\C-e": end-of-line
+"\C-b": backward-char
+"\C-f": forward-char
+"\C-p": previous-history
+"\C-n": next-history
+"\C-r": reverse-search-history
+"\C-k": kill-line
+"\C-u": unix-line-discard
+"\C-w": unix-word-rubout
+
+# custom binds
+"\C- ": shell-expand-line
+"\C-x": glob-expand-word
+"\C-g": "git diff\n"
+"\C-y": "| ccze\n"
+"\C-o": "\C-u yazi\n\C-u"
+"\C-l": "\C-u clear -x && ls\n"
+
+# ----- normal (command) mode -----
+set keymap vi-command
+"\C-l": clear-screen
+"\C-a": beginning-of-line
+"\C-e": end-of-line
+"\C-r": reverse-search-history