jack/PPT @ ff939b582ea46eb4d4a0f1ebe0a669d3077aa891

jimmylee 530cd82f0d docs: clarify task hint session cache		пре 2 месеци
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2026-04-25-english-speaking-dialogue-prompt-design.md	d2b22fbc40 docs(speaking): add design spec and implementation plan for grade-aware system prompt	пре 2 месеци
2026-04-25-english-speaking-task-hint-modal-design.md	530cd82f0d docs: clarify task hint session cache	пре 2 месеци