docs: add infinite-gratitude and claude-api-cost-optimization to community contributors
- infinite-gratitude: Multi-agent research skill with 10 parallel agents, battle-tested with real case studies (Pet AI, GitHub promotion) - claude-api-cost-optimization: Practical strategies to save 50-90% on Claude API costs Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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