[M3] Doc Generator: PRD + Tech Spec + API Spec + DB Schema

[ComBba]

Overview

Implement the doc_generator node: generate PRD, Technical Specification, API Spec, DB Schema, and App Spec YAML using Claude 4.6 Sonnet with RAG context from DO Knowledge Base.

Acceptance Criteria

• PRD generated (problem, solution, user stories, MVP scope)
• Tech Spec generated (architecture, tech stack, component diagram)
• API Spec generated (RESTful endpoints, request/response schemas)
• DB Schema generated (PostgreSQL CREATE TABLE statements)
• App Spec YAML generated (.do/app.yaml for user's app)
• RAG query to DO Knowledge Base for deployment patterns
• Scope adjustment applied if CONDITIONAL path
• All docs stored in state["generated_docs"]
• SSE events: build.docs.progress

Technical Notes

• Model: anthropic-claude-4.6-sonnet via ChatGradient
• RAG: query_do_knowledge_base() tool for App Platform patterns
• Council analysis (especially Architect and Advocate) informs doc content
• Output format: plain text/markdown for each doc type

Dependencies

• [M2] Decision Gate + Conditional Review (human-in-the-loop) #7 (decision gate routes GO/CONDITIONAL-accepted to doc_generator)

Reference

• docs/reference/09-agent-architecture.md — Node 5: doc_generator

[ComBba]

Implemented in PR #32 — Doc Generator produces PRD, Tech Spec, API Spec, DB Schema