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skills/wiki/references/frontmatter.md

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+# Frontmatter Schema
+
+Every wiki page starts with flat YAML frontmatter. No nested objects. Obsidian's Properties UI requires flat structure.
+
+---
+
+## Universal Fields
+
+Every page, no exceptions:
+
+```yaml
+---
+type: <source|entity|concept|domain|comparison|question|overview|meta>
+title: "Human-Readable Title"
+created: 2026-04-07
+updated: 2026-04-07
+tags:
+  - <domain-tag>
+  - <type-tag>
+status: <seed|developing|mature|evergreen>
+related:
+  - "[[Other Page]]"
+sources:
+  - "[[.raw/articles/source-file.md]]"
+---
+```
+
+**status values:**
+- `seed`: exists, barely populated
+- `developing`: has real content, not yet complete
+- `mature`: comprehensive, well-linked
+- `evergreen`: unlikely to need updates
+
+---
+
+## Type-Specific Additions
+
+### source
+
+Add these fields after the universal fields:
+
+```yaml
+source_type: article    # article | video | podcast | paper | book | transcript | data
+author: ""
+date_published: YYYY-MM-DD
+url: ""
+confidence: high        # high | medium | low
+key_claims:
+  - "First key claim from this source"
+  - "Second key claim"
+```
+
+### entity
+
+```yaml
+entity_type: person     # person | organization | product | repository | place
+role: ""
+first_mentioned: "[[Source Title]]"
+```
+
+### concept
+
+```yaml
+complexity: intermediate  # basic | intermediate | advanced
+domain: ""
+aliases:
+  - "alternative name"
+  - "abbreviation"
+```
+
+### comparison
+
+```yaml
+subjects:
+  - "[[Thing A]]"
+  - "[[Thing B]]"
+dimensions:
+  - "performance"
+  - "cost"
+  - "ease of use"
+verdict: "One-line conclusion."
+```
+
+### question
+
+```yaml
+question: "The original query as asked."
+answer_quality: solid   # draft | solid | definitive
+```
+
+### domain
+
+```yaml
+subdomain_of: ""        # leave empty for top-level domains
+page_count: 0
+```
+
+---
+
+## Rules
+
+1. Use flat YAML only. Never nest objects.
+2. Dates as `YYYY-MM-DD` strings, not ISO datetime.
+3. Lists always use the `- item` format, not inline `[a, b, c]`.
+4. Wikilinks in YAML fields must be quoted: `"[[Page Name]]"`.
+5. Keep `related` and `sources` as wikilinks, not plain URLs.
+6. Update `updated` every time you edit the page content.