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diff --git a/web/core/src/index.ts b/web/core/src/index.ts
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+++ b/web/core/src/index.ts
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+// @tidyindex/core — shared, platform-agnostic domain code for the
+// SvelteKit UI (web/ui) and the Hono API (web/api).
+//
+// Rules of the road:
+//   - No imports from SvelteKit, Vite, Workers, Node-only modules, or
+//     anything platform-specific. Pass platform values in as arguments.
+//   - Use Web Crypto (./crypto), not node:crypto.
+//   - No module-level state. Functions take a Db (or other context) as
+//     their first argument.
+//
+// Real submodules will be added in subsequent passes (db, keys, auth,
+// usage, plans, accounts). For now this barrel just exists so the
+// workspace wires together.
+
+export const CORE_VERSION = '0.0.0';