text: Title: e_forward() not returning results without IDs named 'src' and 'dest'
  Body: **Describe the bug**
  
  Customer reported bug with GFQL's e_forward() not returning the correct results unless the edge df IDs are named 'src' and 'dest' 
  
  **To Reproduce**
  
  ```
  import graphistry
  import pandas as pd
  from graphistry import (
      # graph operators
      n, e_undirected, e_forward, e_reverse, e,
      # attribute predicates
      is_in, ge, startswith, contains, match as match_re
  )
  import pandas as pd
  
  graphistry.register(...)
  
  edges_df = pd.read_csv('blueprint_edges.csv')
  nodes_df = pd.read_csv('blueprint_nodes.csv')
  
  edges_df['src'] = edges_df['parent_elid']
  edges_df['dest'] = edges_df['elid']
  
  # create two different graphs with the same cols, just named differently: 
  g = graphistry.edges(edges_df, 'parent_elid', 'elid').nodes(nodes_df, 'elid') 
  g2 = graphistry.edges(edges_df, 'src', 'dest').nodes(nodes_df, 'elid') 
  
  # Test: 
  # expected behavior: be able to use e_forward to get edges
  # observed behavior: get no edges back unless using e() or e_undirected()
  def test_eforward(g):
      guc = g.chain([
          n({"elid":"905e3174aa"}),
          e_forward(),
          n()
      ])
  
      print('nodes:\n', guc._nodes, '\n' )
      print('edges:\n', guc._edges)
  
  
  test_eforward(g)
  test_eforward(g2)
  
  # notice that the first call with 'g' does not return any edges, where the call with 'g2' does 
  ```
  
  [blueprint_nodes.zip](https://github.com/user-attachments/files/17929257/blueprint_nodes.zip)
  
  **Expected behavior**
  
  be able to use e_forward to get edges
  
  **Actual behavior**
  
  get no edges back unless using e() or e_undirected(), or change the IDs to `src` and `dest`
  
  **Screenshot** showing differences of counts with same column contents for IDs, but different names: 
  
  ![image](https://github.com/user-attachments/assets/97cc51d2-355d-4a3b-9806-20ef30cf6a4e)
  
  
  **Graphistry GPU server environment**
  
  Hub v2.41.10 
  
  **PyGraphistry API client environment**
   - Where run `Jupyter Lab local`
   - Version  `0.34.17`
   - Python Version `Python 3.8.5`
  
  