fix(render): real AE render — pass -comp, fix export insert, ensure exports bucket

Three bugs surfaced bringing up a real After Effects node (verified: AE 2026
claimed + ran, but produced no usable output):

1. aerender got no -comp/-rqindex → "output argument ignored", nothing rendered.
   - Claim now returns comp_name from content.projects.render_aep_comp (e.g. "frfinal")
     via new Store.GetTemplateCompName; threaded through ClaimedJob → runner.Job →
     aerender args (`-comp <name>`, or `-rqindex 1` fallback when unknown).

2. CreateExportForJob INSERT passed render_quality as a bare param into an enum
   column → 500 ("output-upload-url HTTP 500"), so completed renders had no export.
   - Cast $8::render.render_quality (+ explicit casts for file_type/create_type enums).

3. flatrender-exports bucket didn't exist → uploads would fail anyway.
   - render-svc now MakeBucket(exports, templates) idempotently at startup.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/node-agent/internal/runner/runner.go

@@ -32,6 +32,9 @@ type Job struct {
 	// AEPFilePath is the local path to the downloaded .aep project file.
 	// In a full implementation the agent downloads this from MinIO before calling Run.
 	AEPFilePath string
+	// CompName is the composition to render (-comp), e.g. "frfinal". When empty the
+	// node renders the project's render queue (-rqindex 1) instead.
+	CompName string
 }
 
 // Run executes the render job, calling onProgress and onPreview as it advances.
@@ -103,11 +106,16 @@ func aeRender(ctx context.Context, aePath string, job *Job, outputPath string, o
 
 	// aerender flags:
 	//   -project <path.aep>
+	//   -comp <name>  (or -rqindex 1 when no comp name is known)
 	//   -output  <output.mp4>
-	args := []string{
-		"-project", job.AEPFilePath,
-		"-output", outputPath,
+	// Without -comp/-rqindex, aerender ignores -output and renders nothing.
+	args := []string{"-project", job.AEPFilePath}
+	if job.CompName != "" {
+		args = append(args, "-comp", job.CompName)
+	} else {
+		args = append(args, "-rqindex", "1")
 	}
+	args = append(args, "-output", outputPath)
 
 	log.Printf("[ae] running: %s %v", aePath, args)
 	cmd := exec.CommandContext(ctx, aePath, args...)