Add generic WordPress resource CRUD primitives

[chubes4]

Summary

• Extend the public wordpress.crud-operation runtime command with generic WordPress resource families beyond raw REST routes.
• Add read/list support for post_type and taxonomy descriptors, executable setting value updates/deletes through registered settings, and mutation/delete artifact refs with explicit disposable sandbox boundary evidence.
• Preserve unsupported descriptors for code-owned post type/taxonomy/setting registration paths instead of adding product-specific assumptions.

Tests

• npx tsx tests/wordpress-crud-contracts.test.ts
• npm run test:wordpress-runtime-actions
• npm run test:wordpress-runtime-discovery-contracts
• npm run build

AI assistance

• AI assistance: Yes
• Tool(s): openai/gpt-5.5, OpenCode
• Used for: Implementing generic WordPress CRUD runtime primitives, contract tests, and PR preparation.