Initial wiki structure: SCHEMA, index, log, user profile

SCHEMA.md

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+# Wiki Schema — Hermes Personal Wiki
+
+## Domain
+Personal knowledge base about **larnal** (user), their preferences, projects, and a chronological log of agent activities. Maintained by Hermes Agent.
+
+## Conventions
+- File names: lowercase, hyphens, no spaces
+- Every wiki page starts with YAML frontmatter
+- Use `[[wikilinks]]` to link between pages where relevant
+- Always update `index.md` and `log.md` on every change
+- **log.md is append-only** — never edit past entries
+- Keep task summaries short (1-3 lines per session) — no implementation details
+
+## Frontmatter
+```yaml
+---
+title: Page Title
+created: YYYY-MM-DD
+updated: YYYY-MM-DD
+type: profile | note | project | log
+tags: [from taxonomy below]
+---
+```
+
+## Tag Taxonomy
+- **person**: user profile, identity, preferences
+- **project**: repos, tasks, deliverables
+- **workflow**: processes, skills, setup
+- **log**: activity record
+
+## Pages
+- `entities/user-profile.md` — notes about larnal: identity, preferences, environment setup
+- `log.md` — chronological short activity summaries (append only)
+
+## Update Policy
+- Facts about the user are stable — update only when explicitly corrected
+- Log entries are written once per session and never modified
+- When new info contradicts existing content, keep both with dates