Type.Unknown() is canonical per ADR-012. Both produce identical JSON Schema
output but Unknown communicates intent. Changed in src/graphs/types.ts (metadata,
schema fields) and src/sqlite/tables/{nodes,edges}.ts (AttributesSchema).
The verbatim-module-syntax lint rule was correctly flagging that
GraphConfig is only used in a type position (typeof GraphConfig). Since
typeof resolves purely at the type level, import type works fine here
and is the correct form. No lint exclusion needed.
Also: deno fmt across all files (markdown line wrapping).
