refactor: clean up deprecated functions and unused code

Remove unused files and implement proper version handling:
- Remove unused files: tensorflowUtils.ts, patched-platform-node.ts, test reporters
- Fix 5 TODO items with centralized version management in utils/version.ts
- Clean up duplicate metadata definitions in examples/basicUsage.ts
- Fix rollup config to use @rollup/plugin-terser instead of deprecated package
- Add comprehensive migration plan for deprecated methods (12 methods identified)

This cleanup removes 370 lines of dead code while maintaining full API compatibility.
All tests pass and build system works correctly.

src/utils/version.ts

@@ -0,0 +1,26 @@
+/**
+ * Version utilities for Brainy
+ */
+
+// Package version - this should be updated during the build process
+const BRAINY_VERSION = '0.41.0'
+
+/**
+ * Get the current Brainy package version
+ * @returns The current version string
+ */
+export function getBrainyVersion(): string {
+  return BRAINY_VERSION
+}
+
+/**
+ * Get version information for augmentation metadata
+ * @param service The service/augmentation name
+ * @returns Version metadata object
+ */
+export function getAugmentationVersion(service: string): { augmentation: string; version: string } {
+  return {
+    augmentation: service,
+    version: getBrainyVersion()
+  }
+}