chore: rename ralph-greenfield to ralph-biggun

chore: remove stale specs, placeholder src, and unused artifacts

feat: replace greenfield scaffolding with blueprint task lists

fix: normalize .ralphrc paths, use storyPrefix in docs, and clean up stale specs

feat: add pre-flight environment check to fail fast on missing credentials

fix: archive stale progress.txt between runs and eliminate chore commits

feat: add end-to-end tests through the ralph CLI dispatcher

fix: add CLI entry-point tests and reject zero iterations

fix: allow plan name as sole argument (iterations auto-computed)

feat: add engine loop interior test coverage (4 suites, 49 assertions)

feat: add process group cleanup and iteration timeout to prevent orphaned processes

feat: enforce import boundaries via CLAUDE.md rules, boundary test, and integration test convention

feat: add Playwright E2E integration with phased testing and auto-repair

chore: add deep research prompt for AI-driven E2E testing

feat: add integration gate for real-infrastructure validation stories