PoC: Local onboarding flow for circleci init

[Fab10-CircleCi]

Summary

• When run without authentication, circleci init now scans the repo, detects the tech stack, runs tests locally in Docker, generates .circleci/config.yml, and suggests CI optimizations
• Auto-detects auth state: no token = local-only flow, with token = local flow then offers remote project creation
• Uses chunk-cli/envbuilder for stack detection and Dockerfile generation (builds on PR Import envbuilder #1198)

What it does (Phase 1 steps 2-8)

1. Scan & detect — language, dependencies, test commands, CircleCI convenience image
2. Build & test in Docker — hidden behind timed spinners, only shows output on failure
3. Generate config — valid CircleCI 2.1 .circleci/config.yml (only if tests pass)
4. Suggest optimizations — caching, linting, parallelism based on detected stack

New flags

• --local — force local-only mode even when authenticated
• --skip-docker — skip Docker build/test steps
• --skip-config — skip config generation
• --verbose — stream full Docker output for troubleshooting
• --dir — scan a different directory

Files changed

• cmd/onboard.go — new — core local onboarding logic
• cmd/init.go — modified — wires local flow as pre-step, restructures auth gating
• go.mod / go.sum — modified — adds chunk-cli dependency

Test plan

• circleci init --local --skip-docker --dir <project> — detects stack, generates config
• circleci init --local --dir <project> — full flow with Docker build + test
• circleci init --local --verbose --dir <project> — streams Docker output
• Test with Go, Python, JS/TS projects
• Test with unknown stack (empty dir)
• Verify config not generated when Docker build/tests fail

🤖 Generated with Claude Code