fix: optimize package size and improve test reliability

Major improvements to build process, package optimization, and test infrastructure:

## Package Size Optimization (3.4MB → 2.2MB)
- Remove source maps from npm package (reduce size by 35%)
- Update package.json files field to exclude *.js.map and *.d.ts.map
- Enhanced .npmignore for better exclusion patterns
- Preserve all browser compatibility and universal shims

## Test Infrastructure Fixes
- Increase test timeouts to 120s for TensorFlow operations
- Improve memory management with garbage collection hooks
- Add proper cleanup between tests to prevent file accumulation
- Configure single-fork test execution to reduce memory usage
- Fix test parameter issues in intelligent verb scoring tests

## Bug Fixes
- Fix lock directory creation in FileSystemStorage
- Remove deprecated node-fetch import from api-integration tests
- Fix addVerb() and db.add() parameter usage throughout test suite
- Ensure proper vector dimensions (384) in all test vectors
- Add directory existence checks before lock file operations

## Build & Development
- Update vitest configuration for better concurrency and reliability
- Add comprehensive test cleanup in setup.ts
- Preserve all browser JavaScript functionality and universal compatibility layer

The package now meets size requirements while maintaining full functionality
for both browser and Node.js environments.

vitest.config.ts

@@ -5,8 +5,21 @@ export default defineConfig({
     // Default configuration
     globals: true,
     setupFiles: ['./tests/setup.ts'],
-    testTimeout: 60000, // 60 seconds for TensorFlow operations
-    hookTimeout: 60000,
+    testTimeout: 120000, // 120 seconds for TensorFlow operations
+    hookTimeout: 120000,
+    // Run tests in parallel with limited pool
+    pool: 'forks',
+    poolOptions: {
+      forks: {
+        singleFork: true, // Run all tests in a single fork to reduce memory usage
+        isolate: false, // Don't isolate tests to reduce overhead
+      }
+    },
+    // Limit concurrent tests to reduce memory usage
+    maxConcurrency: 1,
+    // Clear mocks between tests
+    clearMocks: true,
+    restoreMocks: true,
     // Include test files
     include: ['tests/**/*.{test,spec}.{js,ts}'],
     // Default environment