Exit Codes (stable contract)

Onboarding scripts and CI gates may rely on these codes. Meanings never change; new codes are only appended.

Code	Meaning
0	READY — scan succeeded, no blocking problems
1	READY_WITH_WARNINGS — warnings/unknowns found
2	BLOCKED — one or more BLOCKED/ERROR findings
3	INTERNAL_ERROR — DevRepro itself failed
4	USAGE_ERROR — invalid arguments or unreadable policy

devrepro preflight and devrepro check --policy are the intended CI entry points:

# GitHub Actions example
- run: python -m devrepro preflight --policy .devrepro.toml