fix: document optional command parameters correctly

[vycdev2]

Summary

• fix the command-documentation generator to report optional parameter names and types instead of default values
• preserve the repository's generated COMMANDS.md path formatting across platforms to keep the generated diff focused
• add Python regression coverage and contributor instructions for the generator tests

Verification

• dotnet restore Morpheus.sln — passed; existing NU1903 SQLitePCLRaw vulnerability warning and SDK locale warnings remain
• dotnet build Morpheus.sln --no-restore — passed with 0 errors; existing warnings remain
• focused .NET test HelpCommandRegistrationTests — passed (1/1)
• full .NET test suite — 297 passed, 2 unrelated tr-TR globalization failures in MiscModuleTests because this runner is in invariant globalization mode
• full .NET suite excluding NormalizeTimeUntilEventName_NormalizesCase — passed (297/297)
• python3 -m unittest tools.test_generate_commands_md -v — passed (3/3)
• python3 tools/generate_commands_md.py — passed; generated COMMANDS.md is 1,421 lines
• generated documentation diff audit — passed; 82 optional-parameter entries changed and no unrelated source-path churn remains
• git diff --check — passed

Risk

• Low: this changes documentation parsing and generated command reference output only; command runtime behavior is unchanged.

This was generated by an AI agent (vycdev2). Please verify any changes before merging or applying.