docs: update CHANGELOG with repository reorganization and security fix (#46)

[VirtualAgentics]

Description

Updates CHANGELOG.md to document recent repository improvements following the Keep a Changelog format.

Changes

Repository Reorganization

• Created examples/ directory for better code organization
• Moved example_usage.py from root to examples/
• Moved 8 test files from root to tests/ directory
• Moved 4 development documentation files to docs/ directory
• Cleaned up 9 temporary files and empty files
• Updated all documentation references for new structure

Security Improvement

• Fixed Semgrep security warning for API key logging
• Changed log message from 'API key present' to 'Authentication configured'
• Resolved python.lang.security.audit.logging.logger-credential-leak finding

Files Modified

• CHANGELOG.md - Added entries under "Changed" and "Security" sections

Related

Closes #46

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (1)

• CHANGELOG.md is excluded by !**/*.md and included by none

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/update-changelog-issue-46

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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