[0.6.3] Quality improvements

This release focuses on bug fixes, code quality improvements, and enhanced testing.

Bug Fixes:

• Fixed incorrect initialization of the Filter transformer
• Resolved ChaChaResilient loop issues, including proper residue calculation, buffer handling during flush operations, and decryption slice management

Improvements:

• Refactored and extended test suite with additional test cases and cleaner execution using temporary directories
• Enhanced ChaChaResilient and Filter transformer tests for better coverage
• Applied Cargo clippy fixes and formatting improvements

Dependencies:

• Added tempfile as a dev-dependency for improved test infrastructure

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Full Changelog: v0.6.2...v0.6.3