docs: add spec, plan, and tasks for colors and box-model task wording fix (#9)

specs/009-colors-boxmodel-tasks/spec.md

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+# fix: rewrite colors and box-model task descriptions to remove copy-paste answers
+
+**Issue**: [libretech/code-crispies#9](https://git.librete.ch/libretech/code-crispies/issues/9)
+**State**: open
+**Author**: libretech
+**Labels**: none
+**Complexity**: medium
+
+## Issue Body
+
+Pedagogy audit Runde 3: Colors (copy-paste 90%) and Box Model (copy-paste 85%) are the next worst modules after flexbox was fixed. Same pattern — task says 'Add background-color: coral' and student just types it. Rewrite to describe desired outcome: 'The card background should be a warm color.' Accept multiple valid solutions.
+
+## Current State
+
+### Colors Module (`lessons/03-colors.json`) — English only, 4 lessons
+
+| Lesson | Current Task (gives away answer) |
+|--------|----------------------------------|
+| colors-1 | "Add `background-color: seashell`" |
+| colors-2 | "Add `color: coral`" |
+| colors-3 | "Add `border-color: coral`" |
+| colors-4 | "Add `background-color: #ffd700`" |
+
+All 4 validations use `property_value` with exact expected values — only one answer accepted.
+
+### Box Model Module (`lessons/01-box-model.json`) — 6 locales (en, ar, de, es, pl, uk), 8 lessons
+
+| Lesson | Current Task (gives away answer) |
+|--------|----------------------------------|
+| box-model-1 | "Add `padding: 1rem`" |
+| box-model-2 | "Add `border-left: 4px solid steelblue`" |
+| box-model-3 | "Add `margin-bottom: 1rem`" |
+| box-model-4 | "Fix with `box-sizing: border-box`" |
+| box-model-5 | "Set `padding: 8px 1rem`" |
+| box-model-6 | "Set `margin: 0 auto`" |
+| box-model-7 | "Make with `border-radius: 50%`" |
+| box-model-8 | Lists all 3 properties verbatim |
+
+Box model validation messages are already well-written (hint without revealing). The `task` fields contain `<kbd>` tags with exact answers.
+
+## Acceptance Criteria
+
+1. All 4 colors task descriptions rewritten to describe desired visual outcomes
+2. All 8 box-model task descriptions rewritten to describe desired visual outcomes
+3. Students cannot copy-paste from the task into the editor to pass
+4. Colors validations accept multiple valid CSS color values where appropriate
+5. Box-model validation messages remain as-is (already hint without revealing)
+6. All 5 localized box-model files updated to match the English rewrite pattern
+7. Existing tests continue to pass
+8. Lesson descriptions (which teach the concepts) remain unchanged