feat(crush): add installer for Charm's AI coding assistant

crush/README.md

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+---
+title: crush
+homepage: https://github.com/charmbracelet/crush
+tagline: |
+  crush: A terminal-based AI coding assistant from Charm.
+---
+
+To update or switch versions, run `webi crush@stable` (or `@v0.51`, `@beta`,
+etc).
+
+### Files
+
+These are the files / directories that are created and/or modified with this
+install:
+
+```text
+~/.config/envman/PATH.env
+~/.local/bin/crush
+~/.local/opt/crush-VERSION/bin/crush
+~/.local/share/man/man1/crush.1.gz
+~/.local/share/bash-completion/completions/crush
+~/.local/share/zsh/site-functions/_crush
+~/.config/fish/completions/crush.fish
+```
+
+## Cheat Sheet
+
+> `crush` connects to LLM providers (OpenAI, Anthropic, Google, Groq, or local
+> models via Ollama) and gives you a TUI for writing, reviewing, and refactoring
+> code — with session management and a beautiful Charm-powered interface.
+
+### How to Get Started
+
+Set an API key and launch in your project directory:
+
+```sh
+export ANTHROPIC_API_KEY="sk-ant-..."
+cd ~/your-project
+crush
+```
+
+On first run, crush will guide you through provider setup if no key is set.
+
+### How to Switch Models
+
+Press `Ctrl+M` in the TUI to open the model selector. Context is preserved when
+switching.
+
+### How to Use Sessions
+
+```sh
+crush --session feature-auth
+crush --resume
+crush sessions
+```
+
+### How to Use with Local Models
+
+Install [ollama](../ollama/) (also available via webi), then configure crush:
+
+```sh
+webi ollama
+ollama serve &
+ollama pull qwen2.5-coder:32b
+```
+
+Add to `~/.config/crush/config.yaml`:
+
+```yaml
+providers:
+  - id: ollama
+    name: Ollama
+    type: ollama
+    base_url: http://localhost:11434
+
+default_provider: ollama
+default_model: qwen2.5-coder:32b
+```
+
+### Shell Completions
+
+Shell completions for bash, zsh, and fish are installed automatically. For zsh,
+you may need to ensure the completions directory is in your fpath:
+
+```sh
+fpath=(~/.local/share/zsh/site-functions $fpath)
+```