Add wp term prune command to remove terms with 0 or 1 published posts

[Copilot]

• Add prune method to Term_Command class in src/Term_Command.php
• Update class-level docblock to include prune example
• Add "term prune" to the commands list in composer.json
• Create features/term-prune.feature with Behat tests
• Run linting and code style checks - all pass
• Run static analysis (PHPStan) - no errors
• Address code review feedback (removed unreachable else block, renamed variable)
• Combine the two separate foreach loops over $args into a single loop
• Remove unused $prunable variable
• Replace get_terms() + PHP filtering with direct $wpdb->get_col() query for performance
• Improve false-return warning message for wp_delete_term()

Original prompt

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This section details on the original issue you should resolve

<issue_title>Prune terms with one or less published posts</issue_title>
<issue_description>On large sites with thousands of tags or other terms, it would be helpful to have wp term prune to delete terms with one or less published posts.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Prune terms with one or less published posts #585

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[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Term_Command.php	87.50%	4 Missing ⚠️

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