Move data product registry into Semantic module

[earthshiner]

Summary

• replace governance.data_product_registry with {{DB_SEMANTIC_STD_T}}.data_product_registry in the Semantic standard introduced by PR Add data product orientation layer #6
• update registry comments and module lists to describe the registry as part of the Semantic module
• update the Memory design-decision seed and agent lifecycle reference
• update the access prompt fallback to query {SemanticDatabase}.data_product_registry

Rationale

PR #6 added the Data Product Orientation Layer, but it placed the registry in governance.data_product_registry. governance is not a database defined by the AI-native data product standard. The registry is product orientation metadata and should live inside the Semantic module, alongside data_product_map and the other metadata surfaces agents use for discovery.

This keeps the standard self-contained: agents discover the product manifest first, then use the Semantic module registry and metadata map before navigating to data.

Verification

• rg confirmed no remaining governance.data_product_registry references in the updated standards, prompts, or lifecycle doc.