code-crispies/specs/004-pedagogical-messages/spec.md

fix: validation error messages reveal the solution instead of guiding learning

Issue: #4 Repository: libretech/code-crispies Author: libretech State: open Labels: none

Issue Body

Pedagogy audit: 88% of exercises reveal the answer in error messages, creating a fail-then-copy loop. Change validation messages from 'Set padding: 1rem' to 'Which property adds space between content and the element edge?' This applies across all modules — start with flexbox, box-model, and colors (the 3 worst offenders).

Acceptance Criteria

1. Validation error messages in flexbox, box-model, and colors modules must no longer reveal the exact CSS property-value answer
2. Replacement messages should use pedagogical hints: concept questions, property-name hints, or directional guidance — never the literal solution
3. All remaining English lesson modules with answer-revealing messages must also be rewritten
4. Localized variants (ar/, de/, es/, pl/, uk/) of affected modules must be updated with equivalent pedagogical messages in each language
5. Existing validations (type, value, options) must remain unchanged — only the "message" field is modified
6. All existing tests must continue to pass

Scope

English priority modules (100% answer-revealing):

• lessons/flexbox.json — 6 messages
• lessons/01-box-model.json — 10 messages
• lessons/03-colors.json — 4 messages
• lessons/12-positioning.json — 5 messages

English remaining modules (partial answer-revealing):

• lessons/00-basics.json — 4 of 26
• lessons/00-basic-selectors.json — 15 of 18
• lessons/01-advanced-selectors.json — 8 of 49
• lessons/04-typography.json — 1 of 9
• lessons/05-units-variables.json — 3 of 5
• lessons/06-transitions-animations.json — 8 of 13
• lessons/07-layouts.json — 8 of 11
• lessons/08-responsive.json — 8 of 10
• lessons/09-gradients.json — 3 of 7
• lessons/10-tailwind-basics.json — 16 of 17
• lessons/11-filters.json — 4 of 7
• lessons/13-pseudo-elements.json — 4 of 8
• lessons/grid.json — 5 of 9

Localized variants (each language directory):

• lessons/ar/ — Arabic
• lessons/de/ — German
• lessons/es/ — Spanish
• lessons/pl/ — Polish
• lessons/uk/ — Ukrainian