winTerm v0.3 Shell Experience

[HelloThisWorld]

Summary

• Add the v0.3 Shell Experience foundation: PowerShell and CMD integration assets, safe compatibility commands, diagnostics, completion boundaries, and a Windows API helper.
• Add protocol/session metadata and in-memory paste risk analysis without changing the terminal input layer.
• Package shell assets, add CI/source validation, document the architecture and record the unverified runtime acceptance work.

Validation

• Parsed all winTerm PowerShell sources.
• Verified CMD macro collision handling and space-containing shim paths.
• Ran git diff --check.

Not run

• PowerShell 7 runtime tests, C++ builds, MSIX packaging, and launch/UI tests are unavailable on this machine (PowerShell 7, Visual Studio/MSBuild, and the Windows SDK are absent; local execution policy blocks script execution without a policy override).