Santoshrt999

Apply the modernization changes from analysis.md (produced by java-modernization-review) to create a Java 21 version of the reviewed file. Only run after the user has reviewed and approved analysis.md.

Analyzes Java 8+ code and recommends upgrades to Java 21 standards, covering all feature releases from Java 9 through 21. Specialized for financial systems, it covers streams, Optional, records, sealed classes, pattern matching, virtual threads, structured concurrency, and financial-domain safety rules.