RED: Database Layer tests - CRUD and relationships

[todo-mdx]

Write failing tests for Database.do integration.

Test cases:

• Schema generated from $.nouns() definitions
• create() inserts record and returns typed result
• get() retrieves by ID
• update() modifies record
• delete() removes record
• list() returns all with pagination
• find() queries with filters
• search() does full-text search
• semanticSearch() does vector search
• Forward refs (->) resolve related entities
• Fuzzy refs (~>) match or create
• Back refs (<-) find linking entities
• Batch loading prevents N+1
• DBPromise pipelining works