- ARCHITECTURE.md: new Design Principles section covering filesystem as
source of truth, convention over configuration, no hardcoded exceptions,
AI-first knowledge graph, and three-representation model
- ABSTRACTIONS.md: design philosophy intro + semantic field names table
documenting all conventional frontmatter fields and their UI behavior
Convention over configuration principle explicitly noted as serving
AI-readability: shared conventions make vaults navigable by AI agents
without bespoke per-vault instructions.
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