[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/fastfetch/config.jsonc

@@ -0,0 +1,108 @@
+{
+    "$schema": "https://github.com/fastfetch-cli/fastfetch/raw/dev/doc/json_schema.json",
+    "logo": {
+        "source": "$(find \"${XDG_CONFIG_HOME:-$HOME/.config}/fastfetch/pngs/\" -name \"*.png\" | shuf -n 1)",
+        "height": 18
+    },
+    "display": {
+        "separator": " : "
+    },
+    "modules": [
+        {
+            "type": "custom",
+            "format": "\u001b[36m  "
+        },
+        {
+            "type": "custom",
+            "format": "┌──────────────────────────────────────────┐"
+        },
+        {
+            "type": "os",
+            "key": "   OS",
+            "keyColor": "red"
+        },
+        {
+            "type": "kernel",
+            "key": "   Kernel",
+            "keyColor": "red"
+        },
+        {
+            "type": "packages",
+            "key": "   Packages",
+            "keyColor": "green"
+        },
+        {
+            "type": "display",
+            "key": "   Display",
+            "keyColor": "green"
+        },
+        {
+            "type": "wm",
+            "key": "   WM",
+            "keyColor": "yellow"
+        },
+        {
+            "type": "terminal",
+            "key": "   Terminal",
+            "keyColor": "yellow"
+        },
+        {
+            "type": "custom",
+            "format": "└──────────────────────────────────────────┘"
+        },
+        "break",
+        {
+            "type": "title",
+            "key": "  "
+        },
+        {
+            "type": "custom",
+            "format": "┌──────────────────────────────────────────┐"
+        },
+        {
+            "type": "cpu",
+            "format": "{1}",
+            "key": "   CPU",
+            "keyColor": "blue"
+        },
+        {
+            "type": "gpu",
+            "format": "{2}",
+            "key": "   GPU",
+            "keyColor": "blue"
+        },
+        {
+            "type": "gpu",
+            "format": "{3}",
+            "key": "   GPU Driver",
+            "keyColor": "magenta"
+        },
+        {
+             "type": "memory",
+            "key": "  ﬙ Memory",
+            "keyColor": "magenta"
+        },      
+        {
+            "type": "command",
+            "key": "  󱦟 OS Age ",
+            "keyColor": "31",
+            "text": "birth_install=$(stat -c %W /); current=$(date +%s); time_progression=$((current - birth_install)); days_difference=$((time_progression / 86400)); echo $days_difference days"
+        },
+        {
+            "type": "uptime",
+            "key": "  󱫐 Uptime ",
+            "keyColor": "red"
+        },
+        {
+            "type": "custom",
+            "format": "└──────────────────────────────────────────┘"
+        },
+	{
+            "type": "colors",
+            "paddingLeft": 2,
+            "symbol": "circle"
+        },
+        "break"
+        
+    ]
+}