fix: replace answer-revealing validation messages with pedagogical hints #6

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libretech wants to merge 0 commits from 004-pedagogical-messages into main

pull from: 004-pedagogical-messages

merge into: public:main

public:main

public:012-filters-tasks

public:009-colors-boxmodel-tasks

public:feat/impl-feature-20260328-200101-ecae

public:004-validation-messages

public:003-flexbox-task-wording

public:feat/impl-feature-20260328-133515-7069

public:autoclaude

public:feature/new-lessons

public:feature/section-color-coding

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