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/blockchain_http_launcher.py

@@ -26,12 +26,26 @@ def main():
             '--host', '0.0.0.0',
             '--port', '8005'
         ], check=True)
-    except Exception as e:
-        logger.error(f"Error launching blockchain HTTP: {e}")
+    except subprocess.CalledProcessError as e:
+        logger.error(f"Blockchain HTTP service failed with exit code {e.returncode}: {e}")
         # Fallback
         import time
         while True:
-            logger.info("Blockchain HTTP service heartbeat")
+            logger.info("Blockchain HTTP service heartbeat (fallback mode)")
+            time.sleep(30)
+    except (FileNotFoundError, PermissionError) as e:
+        logger.error(f"Cannot launch blockchain HTTP service: {type(e).__name__}: {e}")
+        # Fallback
+        import time
+        while True:
+            logger.info("Blockchain HTTP service heartbeat (fallback mode)")
+            time.sleep(30)
+    except Exception as e:
+        logger.error(f"Unexpected error launching blockchain HTTP: {type(e).__name__}: {e}")
+        # Fallback
+        import time
+        while True:
+            logger.info("Blockchain HTTP service heartbeat (fallback mode)")
             time.sleep(30)
 
 if __name__ == "__main__":