feat: battle-tested skill patterns from production deployment
Backport production-learned brain-operations patterns:
- Iron Law of Back-Linking (mandatory bidirectional linking)
- Brain filing rules (file by primary subject, not format)
- Enrichment protocol (7-step pipeline, 3-tier system, person/company templates)
- Media ingest workflows (articles, videos, podcasts, PDFs, screenshots)
- Citation requirements (mandatory [Source: ...] on every fact)
- Test Before Bulk operating principle
- Voice recipe: unicode crash fix, PII scrub, identity-first prompt, DIY STT+LLM+TTS
- X-to-Brain recipe: image OCR, Filtered Stream, tweet rating rubric, cron stagger
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