Add plugin-check and verify-build workflows

[jeremyfelt]

Summary

• Add plugin-check.yml workflow (WP.org plugin check via shared happyprime/workflows)
• Add verify-build.yml workflow (Node 24 build verification via shared happyprime/workflows)

Test plan

• Verify plugin-check workflow runs on this PR
• Verify verify-build workflow runs on this PR

🤖 Generated with Claude Code

[github-actions]

🔍 WordPress Plugin Check Report

❌ Status: Failed

📊 Report

🎯 Total Issues	❌ Errors	⚠️ Warnings
1	1	0

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❌ Errors (1)

📁 src/Init.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

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🤖 Generated by WordPress Plugin Check Action • Learn more about Plugin Check