chore(shell): powerlevel10k prompt, host-aware bootstrap, drop thefuck

- zsh prompt: replace oh-my-posh with powerlevel10k via zinit, with the
  instant-prompt preamble near the top of .zshrc for fast startup
- remove thefuck/thefk entirely: .zshrc aliases, install-thefk,
  home_config/thefuck, and its .stow-global-ignore entry
- link-dotfiles: one-shot host-aware bootstrap — detect macOS vs Linux,
  install GNU stow if missing (brew / apt/dnf/pacman), then stow both trees
- retire oh-my-posh: delete the bash + pwsh installers and
  home_config/ohmyposh (starship covers PowerShell separately)
- README: document the new bootstrap and prompt setup

README.md

@@ -5,19 +5,22 @@ Personal dotfiles. Configs are organized by where they get linked:
 | Folder         | Links into   | Examples                          |
 | -------------- | ------------ | --------------------------------- |
 | `home_root`    | `~`          | `.zshrc`, `.wezterm.lua`, `.nanorc` |
-| `home_config`  | `~/.config`  | `nvim`, `ohmyposh`, `zellij`, `ghostty` |
+| `home_config`  | `~/.config`  | `nvim`, `zellij`, `ghostty`, `aerospace` |
 | `windows`      | Windows-only | `windows-terminal/settings.json`  |
 | `lk-installers`| n/a          | helper scripts to install tooling |
 
 ## Linux / macOS (GNU stow)
 
-Requires [`stow`](https://www.gnu.org/software/stow/).
+One-shot, host-aware:
 
 ```bash
 ./link-dotfiles
 ```
 
-This runs `stow home_root` and `stow --target=$HOME/.config home_config`.
+It detects the host (macOS vs Linux), installs [`stow`](https://www.gnu.org/software/stow/)
+if missing (Homebrew on macOS; apt/dnf/pacman on Linux), then runs
+`stow home_root` and `stow --target=$HOME/.config home_config`. Re-running is
+safe — stow is idempotent.
 
 ## Windows (PowerShell)
 
@@ -45,27 +48,15 @@ write straight back into this repo. The settings include the **Australis**
 color scheme and the **VictorMono Nerd Font Mono** profile font; install the
 font (see below) so glyphs render.
 
-## Installers
+## Prompt
 
-| Script                          | Platform | Purpose            |
-| ------------------------------- | -------- | ------------------ |
-| `lk-installers/install-ohmyposh`     | bash     | oh-my-posh (Linux/macOS) |
-| `lk-installers/install-ohmyposh.ps1` | pwsh     | oh-my-posh (Windows, via winget) |
+**zsh uses [Powerlevel10k](https://github.com/romkatv/powerlevel10k)** — loaded
+through zinit straight from `.zshrc`, with the instant-prompt preamble near the
+top for fast startup. The theme config lives at `home_root/.p10k.zsh` (stowed to
+`~/.p10k.zsh`); there's no separate installer — zinit fetches it on first shell
+start.
 
-```powershell
-# Windows: install oh-my-posh, then link
-pwsh -File .\lk-installers\install-ohmyposh.ps1
-pwsh -File .\link-dotfiles.ps1
-```
+PowerShell uses [starship](https://starship.rs/) (configured separately).
 
-### oh-my-posh
-
-The prompt theme lives at `home_config/ohmyposh/lkraven.toml` and is loaded from
-your shell profile, e.g. in PowerShell:
-
-```powershell
-oh-my-posh init pwsh --config '~/.config/ohmyposh/lkraven.toml' | Invoke-Expression
-```
-
-It expects a Nerd Font (e.g. **VictorMono Nerd Font Mono**) to be installed and
-selected in your terminal for the glyphs to render correctly.
+Both expect a **Nerd Font v3** (e.g. **VictorMono Nerd Font Mono**) installed and
+selected in your terminal for glyphs to render.