[codex] Prepare Push MD for WordPress.org submission

[artpi]

Summary

• Build Push MD as a readable WordPress.org submission zip with a bundled php-toolkit/ runtime instead of a PHAR.
• Prune development/test/docs/vendor noise from the built zip and add release checks for forbidden submission files.
• Rename Push MD-owned globals/hooks to push_md_*, replace the YAML/front matter dependency path with a small parser, and harden Plugin Check findings in the bundled toolkit path.
• Remove the activation redirect and expose Push MD through an explicit plugin-row action link instead.

Why

This prepares Push MD for WordPress.org review, where the submitted zip must be complete, human-readable, GPL-compatible, and clean under Plugin Check across every bundled PHP file.

Validation

• vendor/bin/phpunit components/Markdown/Tests/ components/Filesystem/Tests/ components/Git/Tests/
• vendor/bin/phpunit plugins/push-md/Tests/
• bash bin/test-push-md-git-actions.sh
• bash bin/build-plugins.sh
• bash bin/inspect-push-md-zip.sh dist/plugins/push-md.zip
• php -l plugins/push-md/push-md.php
• vendor/bin/phpcs -d memory_limit=1G plugins/push-md/push-md.php
• composer lint still exits with the existing repo-wide warning baseline outside the touched Push MD submission files.

Reviewer Notes

• The WordPress.org artifact is generated with bash bin/build-plugins.sh; dist/plugins/push-md.zip contains push-md/ plus readable push-md/php-toolkit/ runtime files.
• The runtime bundle does not require Composer install on the target WordPress site and does not ship as a PHAR.
• CommonMark remains bundled for Markdown parsing; the YAML/front matter dependency path was removed for this submission pass.

[github-actions]

✅ WordPress Plugin Check Report

✅ Status: Passed

📊 Report

All checks passed! No errors or warnings found.

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