feat: add idea-darwin for structured idea iteration and evolution (#469)

Darwinian idea evolution engine — toss rough ideas onto an evolution
island, let them compete, crossbreed, and mutate through structured
rounds to surface the strongest concepts.

GitHub: https://github.com/warmskull/idea-darwin
Risk: safe

Co-authored-by: unknown <zhaijianyang@company.local>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

skills/idea-darwin/SKILL.md

@@ -0,0 +1,120 @@
+---
+name: idea-darwin
+description: "Darwinian idea evolution engine — toss rough ideas onto an evolution island, let them compete, crossbreed, and mutate through structured rounds to surface your strongest concepts."
+risk: safe
+source: community
+date_added: "2026-04-07"
+---
+
+# Idea Darwin Engine
+
+A round-based idea iteration system that treats ideas as competing organisms — scoring, selecting, crossing, and evolving them through structured rounds to surface the strongest concepts.
+
+## Overview
+
+Most idea management tools are filing cabinets: they store ideas, tag them, and let them rot. Idea Darwin flips the paradigm — instead of organizing ideas, it lets them **compete**. Every idea is a living species on an evolution island. Each round, the fittest get deepened, different ideas cross-pollinate to produce unexpected hybrids, and external stimuli trigger mutations.
+
+## When to Use This Skill
+
+- Use when you have many scattered ideas and need to systematically evaluate and develop them
+- Use when you want to discover unexpected connections between ideas from different domains
+- Use when you need structured iteration rather than one-shot brainstorming
+- Use when you want a scoring framework to prioritize which ideas deserve more investment
+
+## Core Concepts
+
+### Evolution Island Metaphor
+
+Your ideas are alive on this island. Like organisms, they follow three core laws:
+
+1. **Evolution** — Each round, the system deepens the most viable ideas through structured research: filling logical gaps, clarifying paths, identifying risks.
+2. **Crossbreeding** — The system cross-pollinates different ideas. A technical approach from work meets an observation from daily life, producing directions you never imagined.
+3. **Mutation** — External stimuli (industry news, theories, conversations) trigger mutations, spawning entirely new species.
+
+### Species Cards
+
+Every idea gets a structured card recording: core question, full description, lineage (parent/child IDs), 6-dimensional scores, and change history.
+
+### 6-Dimensional Scoring
+
+| Dimension | Weight | What It Measures |
+|---|---|---|
+| Novelty | 10% | Genuine breakthrough or repetition? |
+| Feasibility | 20% | Technically and resource-wise achievable? |
+| Value | 20% | Impact if successful? |
+| Logic | 20% | Internally consistent, no gaps? |
+| Cross Potential | 10% | Can spark something new when combined? |
+| Verifiability | 20% | Can we design a validation path? |
+
+### Idea Lifecycle
+
+```
+seed → exploring → refining → crossing → validated → dormant
+```
+
+The user always has final say on all life-or-death decisions. The system only recommends.
+
+## Step-by-Step Guide
+
+### 1. Write Your Ideas
+
+Create an `ideas.md` file:
+
+```markdown
+## Personal knowledge base that learns my style
+I want a system that reads everything I write and gradually learns how I think.
+
+## Commute-to-podcast converter
+Record voice memos during my commute, auto-convert them into podcast scripts.
+```
+
+### 2. Initialize Your Island
+
+```
+/idea-darwin init
+```
+
+### 3. Start Evolving
+
+```
+/idea-darwin round
+```
+
+### 4. Keep Feeding the Island
+
+Append new ideas to `ideas.md`, add environmental variables to `stimuli.md`.
+
+## Examples
+
+### Example 1: Initialize
+
+```
+/idea-darwin init --budget 8 --actions 3
+```
+
+### Example 2: Run Multiple Rounds
+
+```
+/idea-darwin round 3
+```
+
+### Example 3: Manage Ideas
+
+```
+/idea-darwin dormant IDEA-0005
+/idea-darwin wake IDEA-0005
+```
+
+## Best Practices
+
+- Do: Write ideas as rough as you want — the system structures them
+- Do: Add external stimuli to prevent idea convergence
+- Do: Run disruption rounds to surface overlooked ideas
+- Don't: Over-curate initial ideas — let evolution filter
+- Don't: Ignore the "Decisions Needed" section in briefings
+
+## Additional Resources
+
+- [GitHub Repository](https://github.com/warmskull/idea-darwin)
+- Available in 3 languages: English, Chinese, Japanese
+- ClawHub: `clawhub install idea-darwin`