feat: Generate commands or ask questions with `atuin ai` (#3199)

This PR refines the system created in #3178 to be suitable for a v1
release.

---

## Overview

`atuin-ai` is a separate binary that allows for generating commands and
asking questions from the command line.

It is fully opt-in.

## Usage

`atuin ai init` will output bindings for your shell. Currently, bash,
zsh, and fish are supported.

```bash
eval "$(atuin ai init)"
```

Once the hooks are installed, just press `?` on an empty prompt line to
call up the TUI.

`atuin ai` requires an account on [Atuin Hub](https://hub.atuin.sh/);
you will be prompted to log in on first use.

## Features

### Command generation

Prompt the LLM to create a command, and get one back, no fuss. Press
`enter` to run, or `tab` to insert.

```
┌Ask questions or generate a command:──────────────────────────┐
│                                                              │
│ > Get a list of running docker containers                    │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ $ docker ps                                                  │
│                                                              │
└────[Enter]: Run  [Tab]: Insert  [f]: Follow-up  [Esc]: Cancel┘
```

### Follow-up

You can follow-up with `f` to specify a refinement prompt to update the
command that will be inserted.

```
┌Ask questions or generate a command:──────────────────────────┐
│                                                              │
│ > Get a list of running docker containers                    │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ $ docker ps                                                  │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ > Actually I want to get all docker containers               │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ $ docker ps -a                                               │
│                                                              │
└────[Enter]: Run  [Tab]: Insert  [f]: Follow-up  [Esc]: Cancel┘
```

You can also follow-up with questions to get responses in natural
language.

```
┌Ask questions or generate a command:──────────────────────────┐
│                                                              │
│ > Get a list of running docker containers                    │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ $ docker ps                                                  │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ > Actually I want to get all docker containers               │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ $ docker ps -a                                               │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ > What other useful flags to `docker ps` should I know?      │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│   Here are some handy `docker ps` flags:                     │
│                                                              │
│   - `-q` — Only show container IDs (great for piping to      │
│   other commands)                                            │
│   - `-s` — Show container sizes                              │
│   - `-n 5` — Show the last 5 created containers              │
│   - `-l` — Show only the latest created container            │
│   - `--no-trunc` — Don't truncate output (shows full IDs and │
│   commands)                                                  │
│   - `-f` or `--filter` — Filter by condition, e.g.:          │
│     - `-f status=exited` — only exited containers            │
│     - `-f name=myapp` — filter by name                       │
│     - `-f ancestor=nginx` — filter by image                  │
│   - `--format` — Custom output using Go templates, e.g.:     │
│     `--format "table {{.Names}}\t{{.Status}}\t{{.Ports}}"`   │
│                                                              │
│   A common combo is `docker ps -aq` to get all container     │
│   IDs, useful for bulk operations like `docker rm $(docker   │
│   ps -aq)`.                                                  │
│                                                              │
└────[Enter]: Run  [Tab]: Insert  [f]: Follow-up  [Esc]: Cancel┘
```

You can use `enter` or `tab` at any time to run or insert the last
suggested command, even if it was suggested in a previous turn.

### Conversational and search usage

If you prompt the LLM with a question that doesn't imply you want to
generate a command, it can respond in natural language, and use web
search if necessary to fetch the data it needs.

```
┌Ask questions or generate a command:──────────────────────────┐
│                                                              │
│ > What is the latest version of atuin?                       │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ ✓ Used 2 tools                                               │
│                                                              │
│   The latest version of Atuin is **v18.12.0**, available on  │
│   the [GitHub releases                                       │
│   page](https://github.com/atuinsh/atuin/releases).          │
│                                                              │
└─────────────────────────────────[f]: Follow-up  [Esc]: Cancel┘
```

### Dangerous or low-confidence command detection

The LLM scores its confidence in the command, as well as how dangerous
the command is. This information is shown if a threshold is exceeded,
and requires an extra confirmation step before running automatically
with `enter`.

The Atuin Hub server also monitors suggested commands for dangerous
patterns the LLM didn't catch, and appends its own assessment at the end
of the LLM's own assessment.

```
┌Ask questions or generate a command:──────────────────────────┐
│                                                              │
│ > Delete all files from $HOME                                │
│                                                              │
├──────────────────────────────────────────────────────────────┤
│                                                              │
│ $ rm -rf $HOME/*                                             │
│                                                              │
│ ! ⚠️  This will PERMANENTLY delete ALL files and directories │
│   in your home directory, including documents, downloads,    │
│   configurations, SSH keys, and everything else. This is     │
│   irreversible and will likely break your system. Also note  │
│   this won't delete hidden (dot) files — if you want those   │
│   too, that's even more destructive.; [Server] Recursive     │
│   delete of critical directory                               │
│                                                              │
└────[Enter]: Run  [Tab]: Insert  [f]: Follow-up  [Esc]: Cancel┘
```

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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