Keep the headless UI tests from timing out on the slow Windows runner:
decompile a small CoreLib type (System.Object) in the folding and
token-history tests instead of a large one, and raise the shared
decompile-wait timeout so a cold first decompile (JIT plus building a
CoreLib-scale type system) finishes in time.
Assisted-by: Claude:claude-opus-4-8:Claude Code