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$START keeps _ (special entry node). All user-defined roles now require explicit $status enum in frontmatter + matching graph keys. - moderator: remove UNIT_STATUS fallback, error on missing $status - validate: reject _ graph keys for non-$START roles - validate-semantic: remove checkSingleExitRole(), require $status enum - update all test fixtures to use explicit status values - fix examples/analyze-topic.yaml Fixes #86