feat: add 4 community skills — llm-cost-optimizer, prompt-governance, business-investment-advisor, video-content-strategist
Based on PR #448 by chad848. Enhanced with frontmatter normalization,
anti-patterns sections, ghost script reference removal, and broken
cross-reference fixes. Automotive-electrical-engineer excluded (out of
scope for software/AI skills library).
llm-cost-optimizer (engineering/, 192 lines):
- Reduce LLM API spend 40-80% via model routing, caching, compression
- 3 modes: Cost Audit, Optimize, Design Cost-Efficient Architecture
prompt-governance (engineering/, 224 lines):
- Production prompt lifecycle: versioning, eval pipelines, A/B testing
- Distinct from senior-prompt-engineer (writing) — this is ops/governance
business-investment-advisor (finance/, 220 lines):
- Capital allocation: ROI, NPV, IRR, payback, build-vs-buy, lease-vs-buy
- NOT securities advice — business capex decisions only
video-content-strategist (marketing-skill/, 218 lines):
- YouTube strategy, video scripting, short-form pipelines, content atomization
- Fills video gap in 44-skill marketing pod
Co-Authored-By: chad848 <chad848@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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