Implement Program.cs with command processing and exception handling

[Copilot]

Implementation Plan for Program.cs

• Analyze repository structure and understand the codebase
• Review existing Context, Requirements, and TraceMatrix classes
• Run baseline build and tests to understand existing state
• Update Program.cs to implement Main entry point with Context.Create
• Implement Run(Context) public static method with command processing priority
• Handle expected exceptions (ArgumentException, InvalidOperationException) - print and exit with code 1
• Handle unexpected exceptions - print and re-throw
• Create/update tests for Program behavior (9 comprehensive tests added)
• Run full test suite - All 127 tests pass
• Run code review - No issues found
• Run security scan - No vulnerabilities found
• Address PR feedback:
  • Version query now prints ONLY the version string without any prefix
  • XmlDoc summary blocks are now properly indented
  • Created Version property for reuse across methods
  • Added PrintBanner() method that prints after version check but before help/validation/requirements
• All tests updated and passing

Summary

Successfully addressed all PR feedback:

Changes Made:

1. Version Property: Created a private static Version property to retrieve the assembly version, making it reusable
2. Version Output: When --version is specified, only the version string is printed (no "ReqStream version" prefix)
3. Application Banner: Added PrintBanner() method that prints after version check, ensuring help, validation, and requirements processing all start with the same banner
4. XmlDoc Indentation: Fixed all XML documentation summary blocks to use proper indentation (4 spaces)
5. Updated Tests: Modified tests to match new behavior - version test checks for plain output, help test checks for banner

Validation:

• ✅ All 127 tests pass (118 existing + 9 Program tests)
• ✅ Build succeeded with only pre-existing warnings

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature]: Program Behavior</issue_title>
<issue_description>### Problem Statement

The ReqStream Program "placeholder" should be replaced with a real implementation.

Proposed Solution

Update the Program.cs to:

• Have the Main entry point create a Context instance from the arguments and then call a new Run(Context) method. Note that expected exceptions (ArgumentException and possibly InvalidOperationException) should be printed to the console and the program should exit with an exit-code of 1. All other exceptions should also be printed to the console and then re-thrown to cause the program to terminate and event-logs to be generate.
• The Run(Context) method should be public-static so that it can be used by self-validation and unit tests. It should process the commands based on priority. For example:
  • Version query results in printing the application (the assembly containing the Program class) semantic version and then terminating with no error.
  • Help results in printing a usage information and then terminating with no error.
  • Self-Validation should be processed next - for now it can remain unimplemented.
  • Finally requirements processing should be performed - creating a Requirements instance from the Requirements files, exporting if requested, creating a TraceMatrix from the Test files, and exporting if requested.

Alternatives Considered

No response

Additional Context

No response

Priority

High - Blocking current work

Contribution

• I would be willing to submit a PR for this feature

Code of Conduct

• I agree to follow this project's Code of Conduct</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature]: Program Behavior #23

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