chore: bootstrap project structure

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.wiki/CLAUDE.md

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+# Wiki Schema — board-viewer
+
+Project-specific wiki conventions. Read this before any wiki operation.
+
+This wiki follows Karpathy's LLM Wiki pattern:
+**https://gist.github.com/karpathy/442a6bf555914893e9891c11519de94f**
+
+The `using-wiki` skill enforces the workflow and file formats. This file overrides the skill where they conflict.
+
+## Page types
+
+- `entities/` — discrete things this project tracks (people, services, modules).
+- `concepts/` — recurring ideas, design decisions, gotchas.
+- `packages/` — code packages this project produces or consumes.
+- `sources/` — one summary page per ingested external doc; carries `ingested:` and `raw_path:`.
+- `overview.md` — single project-wide overview.
+
+## Naming
+
+- `kebab-case.md`, **Latin only**. Transliterate Cyrillic in filenames; keep the original title in the H1 + frontmatter.
+
+## Domain conventions
+
+<!-- Fill in as the project takes shape — what counts as an entity here, which packages exist, naming idioms specific to this codebase. -->