Enforce core boundary cleanup

[chubes4]

Summary

• replace Homeboy-specific CI/docs with direct Composer PHPStan and smoke checks
• strengthen the no-product smoke to scan production source and bootstrap for downstream product vocabulary
• enforce no production table-creation ownership patterns in the boundary smoke

Verification

• composer validate --strict
• php tests/no-product-imports-smoke.php
• composer smoke
• composer phpstan

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafted the boundary enforcement and CI cleanup changes; Chris to review and validate before merge.