Release 0.2.21; track the StartOS version files

Cut version 0.2.21 (current = v_0_2_21) with the adjudicated DO-item fixes.
Also commits the previously-untracked v_0_2_* version files that
versions/index.ts imports (ROADMAP item D2), so a fresh checkout builds
without dangling imports. The missing v_0_2_2 is intentional (versions are
an unordered set).

Built and verified: ten31portal_x86_64.s9pk packs cleanly at 0.2.21:0,
arch x86_64, SDK 0.4.0.

deploy/startos/install/versions/v_0_2_0.ts

@@ -0,0 +1,16 @@
+import { VersionInfo } from '@start9labs/start-sdk'
+
+export const v_0_2_0 = VersionInfo.of({
+  version: '0.2.0:0',
+  releaseNotes: {
+    en_US:
+      'Investor and fund-administrator accounts. Per-entity access control, built-in document storage (statements, K-1s), and per-investor capital-account statements. Admin screens to create accounts, grant entity access, upload documents, and enter capital-account figures.',
+  },
+  migrations: {
+    // New tables (entity_access, documents, capital_account_statements) and the
+    // users.username column are applied by Alembic on app startup. No StartOS-level
+    // data migration is required.
+    up: async ({ effects }) => {},
+    down: async ({ effects }) => {},
+  },
+})