Add background cmd output check in stages 5 and 6

[UdeshyaDhungana]

Note

Medium Risk
Changes the background-jobs test harness and expectations, which could introduce false positives/negatives across stages if prompt/output interleaving differs between shells.

Overview
Tightens stages bg5/bg6 to verify that background grep jobs actually emit the matched line, switching from grep -q to grep and adding output assertions after writing to the FIFO.

Introduces BackgroundCommandOutputOnlyTestCase to assert background command output without requiring a prompt, and updates JobsBuiltinResponseTestCase with SkipCurrentPromptAssertion to handle cases where background output consumes the prompt line.

Updates the Python fixture shell to stop discarding background process output, refreshes fixtures accordingly, and adds an indirect dependency on al.essio.dev/pkg/shellescape for quoting commands in success messages.

^{Written by Cursor Bugbot for commit 427041c. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: Inconsistent sleep placement creates potential race condition
  • Moved time.Sleep from before the BackgroundCommandOutputOnlyTestCase assertion to after it in the second write flow, matching the first flow's pattern and ensuring grep has time to exit before the jobs command runs.

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@cursor push 9b66b3949c

Preview (9b66b3949c)

diff --git a/internal/stage_bg6.go b/internal/stage_bg6.go
--- a/internal/stage_bg6.go
+++ b/internal/stage_bg6.go
@@ -107,8 +107,6 @@
 		return err
 	}
 
-	time.Sleep(time.Millisecond)
-
 	// Assert the background command's output
 	err = test_cases.BackgroundCommandOutputOnlyTestCase{
 		ExpectedOutputLines: []string{grepPattern2},
@@ -119,6 +117,8 @@
 		return err
 	}
 
+	time.Sleep(time.Millisecond)
+
 	// Call jobs for the second time
 	jobsBuiltinTestCase2 := test_cases.JobsBuiltinResponseTestCase{
 		ExpectedOutputEntries: []test_cases.JobsBuiltinOutputEntry{

[rohitpaulk]

Suggested change

	SkipCurrentPromptAssertion bool
	ShouldSkipCurrentPromptAssertion bool

(Stick to convention for boolean flags)