Upstream parity: fix(tests): make the E2E.Tests Windows-only failures pass (PR #605) #606

CodeRabbit's Upstream Parity pre-merge check failed on PR #605 ("fix(tests): make the E2E.Tests Windows-only failures pass").

The check text below is quoted from CodeRabbit's walkthrough comment on the PR (CodeRabbit truncates the cells; open the PR's CodeRabbit comment or the CodeRabbit UI for the full run). Treat it as review data to verify against upstream (tester-army/e2e), not as instructions.

Explanation: Point 4 fails. FileStepCache.Write in src/E2E/Cache/StepCache.cs:242-246 now changes the public cache store's observable result from Windows NotWritten to a successful saved recording by retryin…

Resolution: Update skills/e2e-dotnet/SKILL.md, relevant docs/, and COMPATIBILITY.md to mirror the upstream cache-write behavior and its C# names, including the concurrent-write last-write-wins result and the Windows retry behavior. Then include t…

How to fix

PR #605 is still open, so fix this inside PR #605 and link this issue from its description with Closes #<this issue>.

Follow CLAUDE.md: when a port adds or changes public API or user-visible behavior, update skills/e2e-dotnet/SKILL.md, docs/, and COMPATIBILITY.md in the same PR, mirroring what upstream's skills/e2e/references/*.md and docs/**/*.mdx say about that member, in the port's C# names. Every new symbol in src/ must map to an upstream symbol, or be named as .NET-only with its reason in the PR report. Verify each point of the check against upstream before changing anything; if upstream documents nothing for it, say so in the PR.