docs(openspec): backfill missing proposals

openspec/changes/refactor-db-drizzle/tasks.md

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+## 1. Scope and Migration Confirmation
+- [x] 1.1 Confirm migration scope (internal DB vs external IDE DB).
+- [x] 1.2 Confirm Drizzle driver choice (keep `better-sqlite3`).
+- [x] 1.3 Confirm no changes to existing database schema.
+
+## 2. Design and Preparation
+- [x] 2.1 Build Drizzle schema (`accounts`/`settings`/`ItemTable`).
+- [x] 2.2 Define connection initialization and pragma strategy (WAL, `busy_timeout`).
+- [x] 2.3 Define runtime validation strategy (external IDE DB, loose compatibility).
+
+## 3. Implementation
+- [x] 3.1 Migrate read/write paths in `cloudHandler.ts`.
+- [x] 3.2 Migrate read/write paths in `database/handler.ts`.
+- [x] 3.3 Preserve existing transaction and retry semantics.
+
+## 4. Testing and Verification
+- [x] 4.1 Update unit tests and mocks.
+- [ ] 4.2 Run regression checks for account backup/restore and injection flow.
+- [ ] 4.3 Complete cross-platform smoke verification (Win/macOS/Linux).