[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/.pi/agent/extensions/vim-toggle.ts

@@ -0,0 +1,44 @@
+/**
+ * `/vim` — toggle the modal input editor off/on
+ *
+ * The modal editor itself is now the **npm package `pi-vim`** (declared in
+ * `settings.json > packages`, configured under `settings.json > piVim`). That
+ * package registers no commands, so this file restores the `/vim` toggle the
+ * local `vim-editor.ts` fork used to provide — the fork is kept beside it as
+ * `vim-editor.ts.disabled` (see ../../CLAUDE.md).
+ *
+ * OFF — drop the custom editor component, which puts pi's stock editor back for
+ *       the rest of the session (handy for a big paste, or any key the modal
+ *       layer swallows).
+ * ON  — `ctx.reload()`, the same flow as `/reload`, re-runs extension discovery
+ *       and so re-installs pi-vim's editor. That reloads statusbar/plan-mode too
+ *       and re-instantiates *this* file, which is why turning it back on needs no
+ *       bookkeeping: the fresh instance starts at `enabled = true` again.
+ *
+ * Nothing is installed on `session_start` — pi-vim already does that, so this
+ * file only ever reacts to the command and never races it for the editor slot.
+ */
+
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+
+export default function (pi: ExtensionAPI) {
+	// pi-vim installs its editor at session_start, so we start out enabled.
+	let enabled = true;
+
+	pi.registerCommand("vim", {
+		description: "Toggle the vim (modal) input editor",
+		handler: async (_args, ctx) => {
+			if (ctx.mode !== "tui") return; // editor components are TUI-only
+			if (enabled) {
+				ctx.ui.setEditorComponent(undefined);
+				enabled = false;
+				ctx.ui.notify("Default editor restored — /vim to re-enable", "info");
+				return;
+			}
+			// Notify *before* awaiting: after the reload this call frame belongs to
+			// the pre-reload instance, and its UI handle is on the way out.
+			ctx.ui.notify("Vim editor enabled", "info");
+			await ctx.reload();
+		},
+	});
+}