Add polyfill for ProcessStartInfo.ArgumentList

[Copilot]

• Add NetCore10/WeakReference.cs — WeakReference<T> for NETFRAMEWORK && !NET45_OR_GREATER
• Add NetCore10/ConditionalWeakTable.cs — ConditionalWeakTable<TKey, TValue> for NETFRAMEWORK && !NET40_OR_GREATER
• Update NetCore30/ProcessStartInfo.cs — widen NETFRAMEWORK guard from NET45_OR_GREATER to NETFRAMEWORK
• Add PolyShim.Tests/NetCore10/WeakReferenceTests.cs
• Add PolyShim.Tests/NetCore10/ConditionalWeakTableTests.cs
• Build and verify

[Copilot]

Pull request overview

Adds a PolyShim member polyfill for System.Diagnostics.ProcessStartInfo.ArgumentList to enable argument-list based process invocation on TFMs where the BCL property isn’t available (e.g., .NET Framework and older .NET Core).

Changes:

• Introduces an extension ArgumentList property backed by a ConditionalWeakTable, rebuilding ProcessStartInfo.Arguments on collection mutations.
• Implements Windows-style command-line argument escaping when materializing Arguments.
• Adds end-to-end tests that spawn cmd/sh to validate multi-arg and space-containing argument behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
PolyShim/NetCore30/ProcessStartInfo.cs	Adds the ProcessStartInfo.ArgumentList member polyfill and argument escaping logic.
PolyShim.Tests/NetCore30/ProcessStartInfoTests.cs	Adds process-based tests intended to validate the new ArgumentList behavior across platforms.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Tyrrrz]

@copilot the build is failing on net35 and net40: https://github.com/Tyrrrz/PolyShim/actions/runs/24629070630/job/72013142864?pr=125

How hard would it be to polyfill those missing APIs?

[Tyrrrz]

@copilot declare ArgumentListCollection as file class at the top of the file, mark with ExcludeFromCoverage same as everything else

[codecov]

Codecov Report

❌ Patch coverage is 91.83673% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.80%. Comparing base (d7bd31b) to head (d71e738).
⚠️ Report is 1 commits behind head on prime.

Files with missing lines	Patch %	Lines
PolyShim.Tests/NetCore30/ProcessStartInfoTests.cs	69.23%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            prime     #125      +/-   ##
==========================================
+ Coverage   90.76%   95.80%   +5.03%     
==========================================
  Files         285      188      -97     
  Lines        4959     3550    -1409     
  Branches      404      169     -235     
==========================================
- Hits         4501     3401    -1100     
+ Misses        366      128     -238     
+ Partials       92       21      -71     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.