Update README.md for WordPress 6.9/7.0 changes

[itsgajendraSingh]

Fixes #164. Extends #150. Related: #101.
Updates the README to reflect changes since the Abilities API merged into WordPress 6.9 core (Dec 2025), the WordPress/abilities-api repo was archived (Feb 2026), and the MCP Adapter shipped in WordPress 7.0 core (April 2026).

Changes

1. Abilities API still listed as a separate required dependency — repo was archived Feb 2026
2. composer require command includes wordpress/abilities-api (archived package)
3. No WordPress minimum version listed — only PHP >= 7.4
4. .wp-env.json example includes WordPress/abilities-api in plugins array
5. Basic Usage says all abilities are "automatically available" — missing meta.mcp.public requirement
6. Code example missing meta.mcp.public flag — ability won't appear on default server without it
7. Abilities API docs link points to archived GitHub repo instead of core dev notes
8. STDIO transport labeled "Testing Only" — it's the primary local dev transport for Claude/Cursor/VS Code
9. No explanation of what the @automattic/mcp-wordpress-remote proxy does

[github-actions]

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[Copilot]

Pull request overview

This PR updates the README.md documentation to reflect changes in WordPress 6.9/7.0 compatibility, specifically addressing the merging of the Abilities API into WordPress core, the archiving of the WordPress/abilities-api repository in February 2026, and the inclusion of the MCP Adapter in WordPress 7.0 core.

Changes:

• Added WordPress version requirement (>= 6.8, with 6.9+ recommended and 7.0+ bundled) and updated Abilities API documentation to reference core dev notes instead of the archived plugin repository
• Updated composer require command to remove the archived wordpress/abilities-api package with conditional installation notes for WordPress 6.8
• Removed WordPress/abilities-api from .wp-env.json example with a note for WordPress 6.8 compatibility
• Clarified that the meta.mcp.public flag is required for abilities to appear on the default MCP server, with updated code examples
• Updated STDIO transport documentation from "Testing Only" to "Local Development" and added explanation of the @automattic/mcp-wordpress-remote proxy
• Added WordPress.com MCP support information and v0.3.0 migration guide reference

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.04%. Comparing base (33659df) to head (4d563a8).

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk     #165   +/-   ##
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  Coverage     88.04%   88.04%           
  Complexity     1236     1236           
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  Files            54       54           
  Lines          4022     4022           
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  Hits           3541     3541           
  Misses          481      481           

Flag	Coverage Δ
unit	88.04% <ø> (ø)

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