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Define the dev-facing CLI contract: `harmony <scope> <verb>` grammar, mandatory explicit context (no default), declarative/operational verb split, three config homes, per-env profile tag, and the machine/agent contract. Add the living CLI use-case & command guide and register it in the mdbook nav. Mark ADR-012 superseded by 025. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>