docs: fix CLAUDE.md file paths and README.md installation instructions

[wzul]

What does this change?

This PR corrects documentation inaccuracies in CLAUDE.md and README.md to align with the actual project structure and improve user onboarding.

Key changes include:

• File Path Corrections: Updated CLAUDE.md to use the correct filenames for core components (e.g., prefixing files with chip-givewp- and adjusting the block gateway class names) to match the actual codebase.
• Component Documentation: Added descriptions for missing form-builder script components (Chip_Givewp_Enqueue_Form_Builder_Scripts and its associated JS).
• Dependency Updates: Expanded the Composer dev dependencies list to include PHPCS/WPCS packages used for code quality.
• Onboarding Clarity: Updated README.md to explicitly state that GiveWP is a prerequisite and clarified that the zip file provided is the gateway plugin, not the core GiveWP plugin.

How to test

1. Verify Paths: Cross-reference the updated file paths in CLAUDE.md against the repository's file system (e.g., check that includes/class-chip-givewp-api.php exists while includes/class-api.php does not).
2. Verify README: Read the "Installation" section of the README.md to ensure the flow is logical for a new user.
3. Verify Links: Ensure the GitHub download link and WordPress.org link in README.md are functional.

Potential Risks & Review Items

• Documentation Drift: While this fixes existing inaccuracies, care should be taken in future PRs to update CLAUDE.md if files are renamed again.
• Zero Runtime Risk: This PR only modifies Markdown files; there is no impact on plugin functionality.

Is this PR safe for automatic approval?

Yes. This is a documentation-only update that synchronizes developer/user guides with the existing codebase.

Images

N/A

Related Tasks / PRs

🤖 Generated with Claude Code
Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com

Checklist

• Unit tests provided? (N/A)
• All tests passing?
• Tested in staging?
• Task link provided?