chore/prepare for public release

[minademian]

• docs: update and polish
• docs(style): cleanup

[Copilot]

Pull Request Overview

This PR streamlines documentation and adds comprehensive test infrastructure for the diff-check utility. The changes focus on consistency in branding, documentation structure, and establishing a robust testing framework with watch capabilities.

Key changes:

• Standardized branding to lowercase naming convention (diff-check, server-audit)
• Cleaned up and consolidated README documentation by removing redundant sections
• Added complete test infrastructure for diff-check including unit, integration test runners and file watcher

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
server-audit/README.md	Streamlined documentation by removing redundant sections and updating project naming
server-audit/Makefile	Updated branding to use lowercase server-audit
diff-check/tests/watch.sh	New file watcher script for test-driven development with fswatch and polling fallback
diff-check/tests/run_unit_tests.sh	New unit test runner with mock SSH key support
diff-check/tests/run_tests.sh	New main test orchestrator handling unit and integration tests
diff-check/tests/run_integration_tests.sh	New integration test runner with modular test execution
diff-check/README.md	Updated badges order and simplified description
diff-check/Makefile	New Makefile with test, coverage, and watch targets
README.md	Updated main README with diff-check utility info and cleaned up acknowledgments

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