feat: Auto-enable WordPress stubs for Intelephense LSP

[superdav42]

Problem

When working on WordPress projects with OpenCode, the Intelephense PHP language server does not recognize WordPress global functions like:

• add_action()
• add_filter()
• wp_send_json()
• do_action()
• apply_filters()

Users must manually configure intelephense.stubs to include "wordpress" in their OpenCode config file, which is not intuitive and creates friction for WordPress developers.

Context

This affects:

1. Full WordPress installations (sites with wp-config.php)
2. WordPress plugins (no core files, but have plugin headers)
3. WordPress themes (no core files, but have theme headers)

The WordPress stubs are already bundled with Intelephense, they just need to be enabled via configuration.

Reference: bmewburn/vscode-intelephense#1302

Proposed Solution

Automatically detect WordPress projects and enable WordPress stubs for Intelephense. Detection should work for:

• Core WordPress files (wp-config.php, wp-content/, etc.)
• Plugin headers (Plugin Name:)
• Theme headers (Theme Name:)
• WordPress code patterns (add_action, add_filter function calls)

Verification

To verify the fix works:

1. Open a WordPress plugin/theme project
2. Open a PHP file with WordPress functions
3. Check that add_action() and other WP functions show completions and hover info

[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• Feature requests must have a title starting with [FEATURE]: (current title: feat: Auto-enable WordPress stubs for Intelephense LSP)
• The official feature request template should be used, which includes a verification checkbox confirming the feature hasn't been suggested before

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

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This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Support PHP Intelephense Stubs #5574: [FEATURE]: Support PHP Intelephense Stubs — same issue: WordPress functions flagged by Intelephense, requesting stubs support

If you believe this was flagged incorrectly, please let a maintainer know.

[superdav42]

Closing as duplicate of #5574 which already requests the same feature. Will update PR to reference the original issue.