Simplify imagegen workflow

arc/workflows/imagegen/imagegen.dot

@@ -1,11 +0,0 @@
-digraph ImageGen {
-    graph [goal="A cute robot painting a landscape"]
-    rankdir=LR
-
-    start [shape=Mdiamond, label="Start"]
-    exit  [shape=Msquare, label="Exit"]
-
-    generate [label="Generate Image", backend="cli", prompt="Generate an image of: $goal\n\nCraft a detailed, vivid prompt and then call the Gemini image generation API using curl.\nThe GEMINI_API_KEY env var is already set in your environment.\nUse model gemini-2.5-flash-image at endpoint generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash-image:generateContent\nPass the key as query param key=... from the env var.\nPOST JSON with contents/parts/text for your prompt and generationConfig responseModalities TEXT and IMAGE.\nExtract the base64 image data from the response using jq, decode with base64 -d, save to generated.png"]
-
-    start -> generate -> exit
-}

arc/workflows/imagegen/imagegen.toml

@@ -1,9 +0,0 @@
-version = 1
-goal = "A cute robot painting a landscape"
-graph = "imagegen.dot"
-
-[sandbox]
-provider = "daytona"
-
-[sandbox.env]
-GEMINI_API_KEY = "${env.GEMINI_API_KEY}"

arc/workflows/imagegen/workflow.dot

@@ -5,7 +5,7 @@ digraph ImageGen {
     start [shape=Mdiamond, label="Start"]
     exit  [shape=Msquare, label="Exit"]
 
-    generate [label="Generate Image", prompt="Generate an image of: $goal\n\nRun: imagegen \"$goal\" generated.png\n\nThen verify the file exists with: ls -la generated.png"]
+    generate [label="Generate Image", prompt="Generate an image of: $goal\n\nRun: mkdir -p output && imagegen \"$goal\" output/generated.png\n\nThen verify the file exists with: ls -la output/generated.png"]
 
     start -> generate -> exit
 }

arc/workflows/imagegen/workflow.toml

@@ -1,6 +1,5 @@
 version = 1
-goal = "A cute robot painting a landscape"
-graph = "imagegen-api.dot"
+graph = "workflow.dot"
 
 [sandbox]
 provider = "daytona"
@@ -8,8 +7,11 @@ provider = "daytona"
 [sandbox.env]
 GEMINI_API_KEY = "${env.GEMINI_API_KEY}"
 
+[assets]
+include = ["output/**"]
+
 [sandbox.daytona.snapshot]
-name = "imagegen-tools-v3"
+name = "imagegen-tools-v4"
 cpu = 4
 memory = 8
 disk = 10