fix: early Session-ID output + Gemini -p display correction

- Output Session-ID to stderr immediately when backend reports
  session_started, so Claude can capture it even if task times out
- Fix Command: display line to show actual task text instead of
  misleading -p - for Gemini backend (geminiDirect logic)
- Bump codeagent-wrapper 5.8.0 → 5.9.0
- Bump EXPECTED_BINARY_VERSION to 5.9.0

codeagent-wrapper/executor.go

@@ -1069,6 +1069,23 @@ func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backe
 		}
 	}
 
+	// Emit Session-ID to stderr as soon as the backend reports it.
+	// This lets Claude Code capture the real session ID even if the
+	// task later times out or fails (where the final SESSION_ID: line
+	// in stdout would never be printed).
+	// Skip in silent mode (parallel tasks) to avoid polluting stderr.
+	var sessionIDEmitted bool
+	var onSessionStartedCallback func(string)
+	if !silent {
+		onSessionStartedCallback = func(id string) {
+			if sessionIDEmitted || id == "" {
+				return
+			}
+			sessionIDEmitted = true
+			fmt.Fprintf(os.Stderr, "  Session-ID: %s\n", id)
+		}
+	}
+
 	go func() {
 		msg, tid := parseJSONStreamInternalWithContent(stdoutReader, logWarnFn, logInfoFn, func() {
 			select {
@@ -1084,7 +1101,7 @@ func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backe
 			if globalWebServer != nil && webSessionID != "" {
 				globalWebServer.EndSession(webSessionID, cfg.Backend)
 			}
-		}, onContentCallback, onProgressCallback)
+		}, onContentCallback, onProgressCallback, onSessionStartedCallback)
 		select {
 		case completeSeen <- struct{}{}:
 		default:

codeagent-wrapper/main.go

@@ -14,7 +14,7 @@ import (
 )
 
 const (
-	version               = "5.8.0"
+	version               = "5.9.0"
 	defaultWorkdir        = "."
 	defaultTimeout        = 7200 // seconds (2 hours)
 	defaultCoverageTarget = 90.0
@@ -417,7 +417,10 @@ func run() (exitCode int) {
 	useStdin := cfg.ExplicitStdin || shouldUseStdin(taskText, piped)
 
 	targetArg := taskText
-	if useStdin {
+	// Gemini CLI does not support "-" as stdin marker for -p flag.
+	// Match the geminiDirect logic in executor.go so the display is accurate.
+	geminiDirect := useStdin && cfg.Backend == "gemini"
+	if useStdin && !geminiDirect {
 		targetArg = "-"
 	}
 	codexArgs := buildCodexArgsFn(cfg, targetArg)

codeagent-wrapper/main_test.go

@@ -2601,13 +2601,14 @@ func TestRunSilentMode(t *testing.T) {
 	verbose := capture(false)
 	quiet := capture(true)
 
-	// After refactoring, logs are only written to file, not stderr
-	// Both silent and non-silent modes should produce no stderr output
+	// Silent mode (parallel tasks): no stderr output at all
 	if quiet != "" {
 		t.Fatalf("silent mode should suppress stderr, got: %q", quiet)
 	}
-	if verbose != "" {
-		t.Fatalf("non-silent mode should also suppress stderr (logs go to file), got: %q", verbose)
+	// Non-silent mode (single task): Session-ID is emitted to stderr
+	// so Claude Code can capture it even if the task later fails/times out
+	if !strings.Contains(verbose, "Session-ID: silent-session") {
+		t.Fatalf("non-silent mode should emit Session-ID to stderr, got: %q", verbose)
 	}
 }
 
@@ -3051,7 +3052,7 @@ func TestVersionFlag(t *testing.T) {
 		}
 	})
 
-	want := "codeagent-wrapper version 5.8.0\n"
+	want := "codeagent-wrapper version 5.9.0\n"
 
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
@@ -3067,7 +3068,7 @@ func TestVersionShortFlag(t *testing.T) {
 		}
 	})
 
-	want := "codeagent-wrapper version 5.8.0\n"
+	want := "codeagent-wrapper version 5.9.0\n"
 
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
@@ -3083,7 +3084,7 @@ func TestVersionLegacyAlias(t *testing.T) {
 		}
 	})
 
-	want := "codex-wrapper version 5.8.0\n"
+	want := "codex-wrapper version 5.9.0\n"
 
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)

codeagent-wrapper/parser.go

@@ -97,10 +97,10 @@ type ItemContent struct {
 }
 
 func parseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(string), onMessage func(), onComplete func()) (message, threadID string) {
-	return parseJSONStreamInternalWithContent(r, warnFn, infoFn, onMessage, onComplete, nil, nil)
+	return parseJSONStreamInternalWithContent(r, warnFn, infoFn, onMessage, onComplete, nil, nil, nil)
 }
 
-func parseJSONStreamInternalWithContent(r io.Reader, warnFn func(string), infoFn func(string), onMessage func(), onComplete func(), onContent func(content, contentType string), onProgress func(line string)) (message, threadID string) {
+func parseJSONStreamInternalWithContent(r io.Reader, warnFn func(string), infoFn func(string), onMessage func(), onComplete func(), onContent func(content, contentType string), onProgress func(line string), onSessionStarted func(id string)) (message, threadID string) {
 	reader := bufio.NewReaderSize(r, jsonLineReaderSize)
 
 	if warnFn == nil {
@@ -168,6 +168,9 @@ func parseJSONStreamInternalWithContent(r io.Reader, warnFn func(string), infoFn
 		// Extract session_id early (works for all backends)
 		if event.SessionID != "" && threadID == "" {
 			threadID = event.SessionID
+			if onSessionStarted != nil {
+				onSessionStarted(threadID)
+			}
 		}
 
 		// Detect backend type by field presence
@@ -205,6 +208,9 @@ func parseJSONStreamInternalWithContent(r io.Reader, warnFn func(string), infoFn
 				threadID = event.ThreadID
 				infoFn(fmt.Sprintf("thread.started event thread_id=%s", threadID))
 				emitProgress(formatProgressLine("session_started", map[string]string{"id": threadID}))
+				if onSessionStarted != nil {
+					onSessionStarted(threadID)
+				}
 
 			case "turn.started":
 				emitProgress(formatProgressLine("turn_started", nil))

codeagent-wrapper/parser_unknown_event_test.go

@@ -52,6 +52,7 @@ func TestParseJSONStreamInternalWithContent_EmitsProgressLines(t *testing.T) {
 		nil,
 		nil,
 		func(line string) { progress = append(progress, line) },
+		nil,
 	)
 
 	if message != "Done with changes" {