Covers the agent-backed steps: greenfield vs. existing-codebase build framing, the once-only scaffold retry for a workspace left empty, preset review verdicts (blockers unioned across the chain, an errored review blocks, no matching review passes), the improve prompt carrying the blockers, and deploy executing the decided plan.

## Before writing SPEC.md files

Read https://raw.githubusercontent.com/brillout/sdd/refs/heads/main/sdd.md
