[Repo Assist] Add tests for yield! list<'T> in asyncSeq computation expression

[github-actions]

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Summary

The asyncSeq computation expression has a YieldFrom (s:seq<'T>) overload added in PR #236. Since F# list<'T> implements IEnumerable<'T> (seq<'T>), yield! someList compiles and runs via that same overload — but this was untested.

This PR adds two tests to make the implicit contract explicit and protect against future regressions:

1. asyncSeq yield! list works — standalone yield! items where items : int list
2. asyncSeq yield! list combines with other yields — yield! items interleaved with explicit yield expressions

Test Status

✅ All 194 tests pass (dotnet test). The 2 new tests both pass on the first attempt, confirming that yield! list already works correctly via the seq<'T> overload.

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[github-actions]

✅ Pull request created: #240