fix(ci): update Linux Named-Pipe test for v1.9 auto-execute-on-switch

The "first invoke_expression" assertion still expected the pre-1.9
contract: the response should contain "Switched to console" AND
"Pipeline NOT executed", forcing the AI to re-issue the call. Since
commit 32f0f56 ("track PSDrive cwd via home-thread cache, bail on
user-cd drift") that path was changed to fold the switch notice into
the response and run the pipeline in the same call — only the
user-cd drift case still bails. The Linux integration test never
saw the new shape and was failing on every push.

Update the assertion to match: first call must show BOTH the switch
notice AND today''s date (proving the pipeline actually ran). The
second call''s assertion is unchanged (existing pipe is reused, no
switch notice expected).

macOS skips this branch entirely (Terminal.app dependency), so this
only affects Linux. Windows runs through `cmd /c start` and doesn''t
hit the "switched to a sibling" path here either, so its existing
green status stays.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: yotsuda

.github/workflows/cross-platform-test.yml

@@ -471,25 +471,29 @@ jobs:
             Write-Host "`n=== Named Pipe tests passed (macOS: connectivity + timer mechanism) ===" -ForegroundColor Green
           } else {
 
-          # Test: invoke_expression with Get-Date (first call - should return get_current_location)
+          # Test: invoke_expression with Get-Date (first call).
+          # Since v1.9 (commit 32f0f56), the "switched to a sibling pipe" path no longer
+          # bails with "Pipeline NOT executed" — it folds the switch notice into the
+          # response and runs the pipeline in the same call. So the first call should
+          # show BOTH the "Switched to console" notice AND the actual Get-Date result.
           Write-Host "`n=== Test: invoke_expression (Get-Date) - First call ===" -ForegroundColor Yellow
           $invokeRequest = '{"jsonrpc":"2.0","id":10,"method":"tools/call","params":{"name":"invoke_expression","arguments":{"pipeline":"Get-Date -Format yyyy-MM-dd"}}}'
           $response = Send-JsonRpc $invokeRequest 60000
           Write-Host "Response (truncated): $($response.Substring(0, [Math]::Min(200, $response.Length)))..."
 
-          if ($response -match "Switched to console" -and $response -match "Pipeline NOT executed") {
-            Write-Host "First invoke_expression: PASSED (expected behavior - command not executed)" -ForegroundColor Green
+          $today = Get-Date -Format "yyyy-MM-dd"
+          if ($response -match "Switched to console" -and $response -match $today) {
+            Write-Host "First invoke_expression: PASSED (switched + executed in one call)" -ForegroundColor Green
           } else {
-            throw "First invoke_expression did not return expected ''Switched to console'' message"
+            throw "First invoke_expression did not return both ''Switched to console'' and today''s date ($today)"
           }
 
-          # Test: invoke_expression with Get-Date (second call - should execute)
+          # Test: invoke_expression with Get-Date (second call - reuses existing pipe, no switch notice)
           Write-Host "`n=== Test: invoke_expression (Get-Date) - Second call ===" -ForegroundColor Yellow
           $invokeRequest = '{"jsonrpc":"2.0","id":11,"method":"tools/call","params":{"name":"invoke_expression","arguments":{"pipeline":"Get-Date -Format yyyy-MM-dd"}}}'
           $response = Send-JsonRpc $invokeRequest 60000
           Write-Host "Response: $response"
 
-          $today = Get-Date -Format "yyyy-MM-dd"
           if ($response -match $today) {
             Write-Host "Second invoke_expression (Get-Date): PASSED" -ForegroundColor Green
           } else {