Redact and cap subprocess diagnostics

internal/adapters/seriatim/subprocess.go

@@ -132,12 +132,13 @@ func (r *SubprocessRunner) Run(ctx context.Context, req MergeRequest) (MergeResu
 	}
 
 	runRes, err := subprocess.Run(ctx, subprocess.RunRequest{
-		Executable:    r.binary,
-		Args:          args,
-		Timeout:       r.timeout,
-		EnvOverrides:  env,
-		StdoutLogPath: req.StdoutLogPath,
-		StderrLogPath: req.StderrLogPath,
+		Executable:      r.binary,
+		Args:            args,
+		Timeout:         r.timeout,
+		EnvOverrides:    env,
+		DiagnosticOwner: "seriatim",
+		StdoutLogPath:   req.StdoutLogPath,
+		StderrLogPath:   req.StderrLogPath,
 	})
 	if err != nil {
 		return MergeResult{
@@ -235,11 +236,12 @@ func (r *SubprocessRunner) Trim(ctx context.Context, req TrimRequest) (TrimResul
 	}
 
 	runRes, err := subprocess.Run(ctx, subprocess.RunRequest{
-		Executable:    binary,
-		Args:          args,
-		Timeout:       timeout,
-		StdoutLogPath: req.StdoutLogPath,
-		StderrLogPath: req.StderrLogPath,
+		Executable:      binary,
+		Args:            args,
+		Timeout:         timeout,
+		DiagnosticOwner: "seriatim",
+		StdoutLogPath:   req.StdoutLogPath,
+		StderrLogPath:   req.StderrLogPath,
 	})
 	if err != nil {
 		return TrimResult{
@@ -323,11 +325,12 @@ func (r *SubprocessRunner) Normalize(ctx context.Context, req NormalizeRequest)
 	}
 
 	runRes, err := subprocess.Run(ctx, subprocess.RunRequest{
-		Executable:    binary,
-		Args:          args,
-		Timeout:       timeout,
-		StdoutLogPath: req.StdoutLogPath,
-		StderrLogPath: req.StderrLogPath,
+		Executable:      binary,
+		Args:            args,
+		Timeout:         timeout,
+		DiagnosticOwner: "seriatim",
+		StdoutLogPath:   req.StdoutLogPath,
+		StderrLogPath:   req.StderrLogPath,
 	})
 	if err != nil {
 		return NormalizeResult{
@@ -428,11 +431,12 @@ func (r *SubprocessRunner) Render(ctx context.Context, req RenderRequest) (Rende
 	}
 
 	runRes, err := subprocess.Run(ctx, subprocess.RunRequest{
-		Executable:    binary,
-		Args:          args,
-		Timeout:       timeout,
-		StdoutLogPath: req.StdoutLogPath,
-		StderrLogPath: req.StderrLogPath,
+		Executable:      binary,
+		Args:            args,
+		Timeout:         timeout,
+		DiagnosticOwner: "seriatim",
+		StdoutLogPath:   req.StdoutLogPath,
+		StderrLogPath:   req.StderrLogPath,
 	})
 	if err != nil {
 		return RenderResult{