Update documentation with new tool examples

[gnodet]

Summary

The fix/async-sleep branch added two new tools (wait_for_text and find_highlighted) but the example files don't include usage examples for them. Additionally, docs/index.md is missing the Claude Code project-scoped config that was added to README.md.

Scope

1. Add examples for wait_for_text

Add a practical example to EXAMPLES.md showing:

• Launching a TUI in buffer mode
• Using wait_for_text to wait for async screen updates
• Contrasting with expect_text (stream vs buffer)

2. Add examples for find_highlighted

Add a practical example to EXAMPLES.md showing:

• Launching a menu-style TUI in buffer mode
• Using find_highlighted to verify which item is selected
• Using the bg parameter for specific color matching

3. Sync docs/index.md with README.md

• Add the Claude Code project-scoped .mcp.json configuration example
• Add the settings.local.json tip for non-interactive approval

Acceptance criteria

• Both new tools have at least one complete example in EXAMPLES.md
• docs/index.md includes Claude Code config
• Examples are consistent with existing style