feat(schema): Exercise.explanation - post-answer why (schema 1.13) - #144
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hint is shown on demand before/during answering, examples are worked examples shown before answering that must not spoil it - neither fits "explain the French word-order rule after the learner answers". Exercise gains an optional explanation (Markdown, max 1000 chars, mirrors hint's shape), not restricted to any exercise type. x-schema-version 1.12 -> 1.13 in both schemas (lockstep). Additive: content without the new field validates unchanged. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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…DME export audit - ext:ref-audio-choice, ext:ref-audio-tiles, ext:ref-speak-and-record (#143) - Exercise.explanation, post-answer "why" (#144, #146; schema 1.12 -> 1.13) - README public-API table + export audit (missing type exports, SetReviewStatus/SetAttribution actually exported now) Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
Exercise.explanation(Markdown, max 1000 chars, mirrorshint's shape): a post-answer "why", distinct fromhint(on demand, before/during) andexamples(before answering, must not spoil).x-schema-version1.12->1.13in both schemas (lockstep),quality-rules.jsonbumped to match, TS types regenerated, schema-baseline fixtures re-synced, schema-diagrams regenerated, stale "currently 1.12" doc claims updated (docs-version-claims gate).Test plan
schema 1.13 - explanation on exercisesblock invalidate.test.ts)make release-check(sync-types-check, schema-diagrams --check, lint, typecheck, test [927 tests], build)make prose-check