v0.9.0 — First-Class Business Domains

What's New

First-class business domains — domains are redesigned from a flat dict[str, list[str]] to a proper Domain model with name, summary, description, metrics, and optional tables. Agents now get business context for domain-specific questions.

Added

• Domain model with name, summary, description, metrics, and optional tables
• lookup_domain tool (12th tool) with fuzzy matching — returns full domain context, metrics with descriptions, and associated tables
• Compact <available_domains> in system prompt — progressive disclosure: prompt shows domain index, lookup_domain gives full context, lookup_metric gives SQL
• Domain validation warnings at tool creation time for unknown metric/table references
• get_domain() helper on DataContract for exact-match domain lookup
• Domain summaries in get_contract_info response

Changed

• Tool count: 12 tools (was 11)
• System prompt rendering: simplified _render_metrics, new _render_domains takes over when domains exist
• list_metrics: uses get_domain() internally

Breaking

• Domain YAML format changed from dict to list[Domain]:

  # Before
  domains:
    revenue: [total_revenue]
  
  # After
  domains:
    - name: revenue
      summary: "Revenue and financial metrics"
      description: "Revenue is recognized at fulfillment, not booking."
      metrics: [total_revenue]

Full Changelog: v0.8.0...v0.9.0