v0.2.0

Every DNS Doctor tool as a command: scan, dmarc-upgrade, parked, signup-url, dmarc-validate, dmarc-generate, spf-count, spf-audit, dkim, report-parse, record, propagation, reverse-dns, and the token-required alerts and readiness reads. Zero runtime dependencies, --json for scripts and agents, exit 0/1/2 with every transient reported as 2, never as a verdict. Fix records are printed verbatim from the API's deterministic engine.