style(storage,workspace): satisfy the repository lint gate

eslint --fix formatting sweep plus the manual residue: sync method
bodies drop async behind Promise-returning signatures (the sqlite unit
routes primitives through a settle() guard preserving the never-throws-
synchronously contract), catch callbacks type their reason as unknown,
loadAll's global slot is plain unknown (null semantics stay in JSDoc),
a non-null assertion becomes a narrowing, and unsafe any assignments in
tests gain explicit types. One justified eslint-disable for
prefer-promise-reject-errors follows the core/session precedent —
wrapping would discard the original StorageError code.

packages/storage/storage/src/backend.ts

@@ -69,7 +69,7 @@ export interface KvUnit {
    * @returns every table's records keyed by table name, plus the global
    * singleton (`null` when never written or not declared).
    */
-  loadAll(): Promise<{ tables: Record<string, Record<string, unknown>>; global: unknown | null }>
+  loadAll(): Promise<{ tables: Record<string, Record<string, unknown>>; global: unknown }>
 
   /**
    * Upsert one record durably. Overwrite semantics: an existing key is replaced.