[Ability] disk-usage — Check wp-content disk usage #7

Use Case

User says "check disk usage" or "how much space is wp-content using". AI returns disk usage breakdown for uploads, plugins, themes, and total wp-content.

Checklist

• Writer: Define natural language triggers (keywords), expected response format, read-only or destructive
• PHP Dev: Create includes/abilities/disk-usage.php with register_agentic_ability()
• JS Dev: Create src/extensions/abilities/disk-usage.js with registerAbility()
• JS Dev: Register in src/extensions/abilities/index.js
• LLM Tester: Add test cases to tests/abilities/core-abilities.test.js
• Build & verify: npm run build and npm run test:abilities

References

• Abilities Guide — full step-by-step
• Third-Party Integration — API reference
• Existing example: includes/abilities/plugin-list.php + src/extensions/abilities/plugin-list.js

Notes

Recursive directory size calculation. Be careful with performance on large uploads dirs — consider capping depth or using du if available. Readonly.