fix(db): add down migration, template-DB test harness, EntryStatus type

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

packages/db/src/schema.ts

@@ -5,6 +5,7 @@
  */
 
 export type Role = "admin" | "member";
+export type EntryStatus = "planned" | "in_progress" | "paused" | "completed" | "dropped" | "none";
 export type Visibility = "private" | "friends" | "public";
 export type TokenScope = "read" | "write" | "ingest";
 export type CustomFieldLevel = "entry" | "engagement" | "copy";
@@ -105,7 +106,7 @@ export interface EntriesTable {
   id: string;
   user_id: string;
   work_id: string;
-  status: string;
+  status: EntryStatus;
   rating: number | null;
   review: string | null;
   private_notes: string | null;