Remove product-boundary knowledge

[chubes4]

Summary

• Remove downstream product names from Agents API source-adjacent docs, smoke fixtures, and static boundary tests.
• Update runtime bundle importer provenance to prefer generic package/source metadata (source_type, source_package, source_version, package_slug, package_version) instead of bundle-specific metadata.
• Remove the product-specific Docs Agent workflow and committed distribution ignore entry that encoded downstream runtime/tooling names.

Testing

• composer test
• composer phpstan
• git ls-files '*.php' | xargs -n 1 php -l
• git diff --check
• git grep -n -i -E 'data[ -]?machine|datamachine|codebox|wp-codebox|datamachine_bundle|DataMachine_' -- . ':!.claude' ':!.datamachine'

Caveats

• Removed the manual Docs Agent workflow because it directly depended on downstream product/runtime names. It can be reintroduced later through a neutral workflow/runtime contract outside Agents API core.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: removed product-specific boundary knowledge from Agents API.