Add design thinking ideate skill

skills/design-thinking/ideate.md

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+# Skill: Design Thinking - Ideate
+
+## Description
+Generates creative solutions using design thinking ideation techniques.
+
+## Input
+- **problem**: Problem statement (required)
+- **constraints**: Technical/business constraints (optional)
+- **personas**: User personas to consider (optional)
+- **inspiration**: Existing solutions for inspiration (optional)
+
+## Techniques Applied
+1. **Brainstorming**: Generate 10+ raw ideas
+2. **SCAMPER**: Substitute, Combine, Adapt, Modify, Put to other uses, Eliminate, Reverse
+3. **How Might We**: Reframe problems as opportunities
+4. **Crazy 8s**: Rapid sketching of solutions
+
+## Output Format
+```json
+{
+  "status": "success",
+  "problem_reframed": "How might we...",
+  "ideas": [
+    {
+      "id": 1,
+      "title": "Idea title",
+      "description": "Brief description",
+      "effort": "low|medium|high",
+      "impact": "low|medium|high",
+      "category": "quick-win|major-project|fill-in|thankless-task"
+    }
+  ],
+  "top_3": [1, 5, 8],
+  "next_step": "Prototype idea #1 with /dt prototype"
+}
+```
+
+## Token Budget
+- Max input: 1000 tokens
+- Max output: 1500 tokens
+
+## Model
+- Recommended: sonnet (creative reasoning)