chore(jest): declare types: ['node', 'jest'] for ts-jest under TS 6.0 (#49)

TypeScript 6.0 stopped automatically including all @types/* packages
globally when the `types` compiler option is unset. Jest globals
(beforeAll, afterEach, afterAll, etc.) used in tests/setup.ts and
throughout the test suite stopped resolving:

  tests/setup.ts:10:1 - error TS2304: Cannot find name 'afterEach'.
  tests/setup.ts:28:1 - error TS2304: Cannot find name 'afterAll'.

The main tsconfig.json doesn't need this change because the build only
covers src/ (which uses no jest globals) and `skipLibCheck: true`
already mutes lib-level surprises. The fix lives in jest.config.js's
inline ts-jest tsconfig — both the .ts and .js transformers — because
that's what compiles the test files.

Verified on both currently-pinned TS 5.9.3 and the proposed TS 6.0.2
(via `--no-save` install): \`npm run lint\` clean, \`npm run type-check\`
clean, \`npm test\` 5490 / 5490 tests pass on each.

Unblocks dependabot PR #34 (typescript 5.9.3 → 6.0.2) — pairs with the
earlier #48 (rootDir) fix to complete TS 6.0 compatibility.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: sjsyrek

jest.config.js

@@ -57,6 +57,9 @@ export default {
         strict: true,
         esModuleInterop: true,
         skipLibCheck: true,
+        // TypeScript 6.0 stopped auto-including all @types/* packages globally;
+        // declare the ones the test suite needs (jest globals + node).
+        types: ['node', 'jest'],
       },
     }],
     '^.+\\.jsx?$': ['ts-jest', {
@@ -65,6 +68,7 @@ export default {
         esModuleInterop: true,
         skipLibCheck: true,
         allowJs: true,
+        types: ['node', 'jest'],
       },
     }],
   },