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-json/src/format.ts

@@ -8,10 +8,10 @@
 import { StorageError } from '@deepseek-ai/dsh-storage'
 import type { KvUnitDescriptor } from '@deepseek-ai/dsh-storage'
 
-/** In-memory authoritative state of one unit; the file is its projection. */
+/** In-memory authoritative state of one unit; the file is its projection. `global` is `null` until first written. */
 export interface UnitState {
   version: number
-  global: unknown | null
+  global: unknown
   tables: Map<string, Map<string, unknown>>
 }