Update Cosmos3-Edge I2V default recipe to 20 steps

Switch recommended I2V settings to 20 steps, CFG 6, flow shift 12, and refresh the example output videos. Approved by I2V owners; side-by-side example reviewed.

README.md

@@ -525,10 +525,10 @@ data = {
     "size": "832x480",
     "num_frames": "121",
     "fps": "24",
-    "num_inference_steps": "50",
-    "guidance_scale": "5.0",
+    "num_inference_steps": "20",
+    "guidance_scale": "6.0",
     "max_sequence_length": "4096",
-    "flow_shift": "3.0",
+    "flow_shift": "12.0",
     "extra_params": json.dumps(
         {
           "use_resolution_template": False,
@@ -788,7 +788,7 @@ pipe = Cosmos3OmniPipeline.from_pretrained(
 )
 pipe.to("cuda")
 pipe.scheduler = UniPCMultistepScheduler.from_config(
-    pipe.scheduler.config, flow_shift=3.0, use_karras_sigmas=False
+    pipe.scheduler.config, flow_shift=12.0, use_karras_sigmas=False
 )
 
 result = pipe(
@@ -799,8 +799,8 @@ result = pipe(
     height=480,
     width=832,
     fps=24.0,
-    num_inference_steps=50,
-    guidance_scale=5.0,
+    num_inference_steps=20,
+    guidance_scale=6.0,
     generator=torch.Generator(device="cuda").manual_seed(0),
     add_resolution_template=False,
     add_duration_template=False,

assets/diffusers_outputs/edge_i2v_diffusers.mp4

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:560e28f9d880b071e04e12c9dd2c214134bb5c159045e322317e515a448276dd
-size 1181482
+oid sha256:10022822f1742388c79eb8403aab7658321d73bd5194788ff41a13bcdff9eef8
+size 24163347

assets/edge_i2v_output.mp4

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:184a1cf43d8de6361a1c823818144bd95c4bdaaed3615b772e36f212c0f5977b
-size 7105138
+oid sha256:10022822f1742388c79eb8403aab7658321d73bd5194788ff41a13bcdff9eef8
+size 24163347