docs: update CLI command syntax across workflow documentation

- Updated marketplace commands: `marketplace --action` → `market` subcommands
- Updated wallet commands: direct flags → `wallet` subcommands
- Updated AI commands: `ai-submit`, `ai-status` → `ai submit`, `ai status`
- Updated blockchain commands: `chain` → `blockchain info`
- Standardized command structure across all workflow files
- Affected files: MULTI_NODE_MASTER_INDEX.md, TEST_MASTER_INDEX.md, multi-node-blockchain-marketplace

services/real_marketplace_launcher.py

@@ -23,12 +23,26 @@ def main():
             '/opt/aitbc/venv/bin/python',
             '/opt/aitbc/services/marketplace.py'
         ], check=True)
-    except Exception as e:
-        logger.error(f"Error launching real marketplace: {e}")
+    except subprocess.CalledProcessError as e:
+        logger.error(f"Marketplace service failed with exit code {e.returncode}: {e}")
         # Fallback
         import time
         while True:
-            logger.info("Real Marketplace service heartbeat")
+            logger.info("Real Marketplace service heartbeat (fallback mode)")
+            time.sleep(30)
+    except (FileNotFoundError, PermissionError) as e:
+        logger.error(f"Cannot launch marketplace service: {type(e).__name__}: {e}")
+        # Fallback
+        import time
+        while True:
+            logger.info("Real Marketplace service heartbeat (fallback mode)")
+            time.sleep(30)
+    except Exception as e:
+        logger.error(f"Unexpected error launching marketplace: {type(e).__name__}: {e}")
+        # Fallback
+        import time
+        while True:
+            logger.info("Real Marketplace service heartbeat (fallback mode)")
             time.sleep(30)
 
 if __name__ == "__main__":