When writing GH comment summary, include error message

[kzu]

We were not including the actual exception message as the first line in the GH comment report.

Fixes #85

[kzu]

🧪 Details on macOS Unix 15.6.1

❌ Demo.Tests.Fails_With_Complex_StackTrace

System.InvalidOperationException : This should not happen!
   at Demo.Tests.Unexpected() in /_/src/Demo/Tests.cs:line 52
   at Demo.Tests.Run() in /_/src/Demo/Tests.cs:line 50
   at Demo.Tests.<Fails_With_Complex_StackTrace>b__6_0() in /_/src/Demo/Tests.cs:line 36
   at Demo.Tests.Fails_With_Complex_StackTrace() in /_/src/Demo/Tests.cs:line 38

❌ Demo.Tests.Fails_With_Output

Assert.Equal() Failure: Values differ
Expected: 42
Actual:   22
   at Demo.Tests.Fails_With_Output() in /_/src/Demo/Tests.cs:line 30

> It was going so well...
> Yet you never know
> Which is why you sprinkle all these WriteLines 👀

❌ Demo.Tests.FailsOnlyOnUnix

Fails on Unix
   at Demo.Tests.FailsOnlyOnUnix() in /_/src/Demo/Tests.cs:line 48

🧪 Details on Ubuntu 24.04.3 LTS

❌ Demo.Tests.Fails_With_Complex_StackTrace

System.InvalidOperationException : This should not happen!
   at Demo.Tests.Unexpected() in /_/src/Demo/Tests.cs:line 52
   at Demo.Tests.Run() in /_/src/Demo/Tests.cs:line 50
   at Demo.Tests.<Fails_With_Complex_StackTrace>b__6_0() in /_/src/Demo/Tests.cs:line 36
   at Demo.Tests.Fails_With_Complex_StackTrace() in /_/src/Demo/Tests.cs:line 38

❌ Demo.Tests.Fails_With_Output

Assert.Equal() Failure: Values differ
Expected: 42
Actual:   22
   at Demo.Tests.Fails_With_Output() in /_/src/Demo/Tests.cs:line 30

> It was going so well...
> Yet you never know
> Which is why you sprinkle all these WriteLines 👀

❌ Demo.Tests.FailsOnlyOnUnix

Fails on Unix
   at Demo.Tests.FailsOnlyOnUnix() in /_/src/Demo/Tests.cs:line 48

🧪 Details on Microsoft Windows 10.0.26100

❌ Demo.Tests.Fails_With_Complex_StackTrace

System.InvalidOperationException : This should not happen!
   at Demo.Tests.Unexpected() in /_/src/Demo/Tests.cs:line 52
   at Demo.Tests.Run() in /_/src/Demo/Tests.cs:line 50
   at Demo.Tests.<Fails_With_Complex_StackTrace>b__6_0() in /_/src/Demo/Tests.cs:line 36
   at Demo.Tests.Fails_With_Complex_StackTrace() in /_/src/Demo/Tests.cs:line 38

❌ Demo.Tests.Fails_With_Output

Assert.Equal() Failure: Values differ
Expected: 42
Actual:   22
   at Demo.Tests.Fails_With_Output() in /_/src/Demo/Tests.cs:line 30

> It was going so well...
> Yet you never know
> Which is why you sprinkle all these WriteLines 👀

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