v2.2.0

• tap operator for debugging and logging intermediate states in a chain.
• filter operator for conditional Success-to-Failure conversion.
• zip operator for combining two Results using Dart 3 Records.
• flatten operator (extension) for unwrapping nested Results.
• recoverWhen operator for conditional recovery by predicate.
• toString() override on Success and Failure for better debug output.
• Best Practices section in README (scoped recovery, custom exceptions with stack trace).