[david-kariuki]

Summary

Introduces the first real workstation software module using the existing module, capability-resolution, execution-planning, and verification frameworks.

The new common-utilities module provides broadly applicable command-line utilities without embedding distro-specific package names or package-manager commands.

Changes

• add modules/common-utilities.sh
• provide portable capabilities for:
  • curl
  • dos2unix
  • nano
  • sed
  • wget
  • xz
• resolve requirements through the existing Ubuntu, Debian, and Kali package mappings
• add module-level verification for expected command availability
• verify the module can be selected through the profile framework
• verify dry-run execution-plan integration
• add common-utilities automated tests
• correct the test harness so failed assertions cannot be followed by a successful command and incorrectly report PASS
• update the README to document the first real workstation module while keeping detailed implementation documentation separate

Validation

All repository validation passes locally:

Bash syntax      PASS
ShellCheck       PASS
shfmt            PASS
Automated tests  PASS
git diff --check PASS

Issues Included

Closes #30