docs: add system prompts official sources (Anthropic + community analyses)
- Add System Prompt Contents section in architecture.md (line 300-326)
- Official Anthropic sources (Tier 1, 100% confidence)
- Community analyses (Simon Willison, PromptHub)
- Claude.ai vs API vs Code CLI distinctions
- Update reference.yaml with 4 new system prompts entries
- system_prompts_official, willison_analysis, prompthub, architecture
- Create resource evaluation: system-prompts-official-vs-community.md
- Score evolution: 4/5 → 3/5 → 2/5 (after Perplexity fact-check)
- Decision: Do not integrate x1xhlol repository (redundant)
- Use official Anthropic sources instead
- Create watchlist for non-integrated resources
- claudedocs/resource-evaluations/watch-list.md (gitignored)
- Re-evaluation triggers: Q2 2026 or if 10+ user requests
Related evaluation: docs/resource-evaluations/system-prompts-official-vs-community.md
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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