WordPress-Specific Best Practices for llms.txt Generation.

## Summary

As a WordPress plugin developer who has implemented `llms.txt` generation, I'd like to propose adding WordPress-specific best practices to the `llms.txt` specification documentation.

## Motivation

WordPress is one of the most popular CMS platforms, and many developers implementing `llms.txt` will be working with WordPress. Having clear guidelines would help ensure consistent, standards-compliant implementations.

## Proposed Additions

### 1. WordPress Content Types
- How to handle custom post types
- Taxonomy organization (categories, tags, custom taxonomies)
- WooCommerce product support

### 2. Security Considerations
- Only including published content
- Excluding private/password-protected posts
- Handling user-generated content

### 3. URL Generation
- Using WordPress permalink functions
- Handling custom post type URLs
- Taxonomy archive URLs

### 4. Performance
- Limiting the number of URLs per section
- Caching considerations
- Large site handling

## Implementation Example

I've implemented these practices in our [SEO Repair Kit](https://wordpress.org/plugins/seo-repair-kit) plugin (coming soon, v2.1.1) and would be happy to:
- Contribute documentation based on our experience
- Help test WordPress-specific scenarios

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**GitHub Profile**: [@cswaqaas](https://github.com/cswaqaas)
**Location**: TorontoDigits, Pakistan

Locate the existing llms.txt specification documentation and review its current structure before adding WordPress-specific guidance. Cover the proposed content types, security, URL generation, and performance considerations, using the implementation experience described in the issue; done means the documentation clearly addresses these scenarios without changing the specification ambiguously.

Written by the indexing model from the issue text.