Add Clawdbot comparison section to README (#10)

Issue asks how Crabcode differs from Clawdbot. The projects serve
entirely different purposes but the distinction wasn't documented.

## Changes

- Added comparison section to README clarifying that Crabcode is a
tmux-based workspace manager for multi-repo development, while Clawdbot
is a personal AI assistant with messaging integrations
- Positioned section prominently after the project tagline for immediate
visibility
- Structured as side-by-side comparison covering: purpose, use cases,
key features, tech stack, and target audience

The two projects have zero functional overlap.

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<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>How is this different than
https://github.com/clawdbot/clawdbot</issue_title>
> <issue_description>?</issue_description>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> </comments>
> 


</details>



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- Fixes #9

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Co-authored-by: mldangelo <michael.l.dangelo@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: 3 people

README.md

@@ -327,6 +327,33 @@ With prefix `Ctrl+a`:
    crab ws 1
    ```
 
+## FAQ
+
+### Why Git worktrees instead of branches?
+
+With branches, switching context means stashing changes, checking out, reinstalling deps, and restarting servers. With worktrees, each workspace is a separate directory - switch instantly by changing tmux windows. No stashing, no reinstalling, no waiting.
+
+### Can I use crabcode with multiple projects?
+
+Yes! Each project gets its own `~/.crabcode/config.yaml`. Run `crab init` in each project directory. Crabcode detects which project you're in based on your current directory.
+
+### How do I clean up old workspaces?
+
+```bash
+crab ws <N> cleanup    # Reset single workspace to origin/main
+crab ws <N> destroy    # Completely remove workspace and worktree
+```
+
+### How is Crabcode different from Clawdbot?
+
+Completely unrelated projects with similar names:
+
+| | Crabcode | [Clawdbot](https://github.com/clawdbot/clawdbot) |
+|---|---|---|
+| **Purpose** | Workspace manager | Personal AI assistant |
+| **Tech** | Bash, tmux, Git worktrees | Node.js, WebSockets |
+| **Use case** | Parallel development environments | Messaging integrations |
+
 ## License
 
 MIT