docs: update command structure for download/upload changes

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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jason-rl

README.md

@@ -147,8 +147,8 @@ rli blueprint from-dockerfile            # Create a blueprint from a Dockerfile
 ```bash
 rli object list                          # List objects
 rli object get <id>                      # Get object details
-rli object download <id> <path>          # Download object to local file
-rli object upload <path>                 # Upload a file as an object
+rli object download <id> [path]          # Download object to local file (path d...
+rli object upload <path>                 # Upload a file as an object (use - to ...
 rli object delete <id>                   # Delete an object (irreversible)
 ```