hyl64 02c2587ca4 fix(agent): support iteration item aliases in child nodes (#14146) ...

## Summary
This PR fixes the iteration variable mismatch reported in #14142.

Changes:
- restore compatibility for `IterationItem@result` by exposing `result`
alongside `item`
- support bare iteration aliases like `{item}`, `{index}`, and
`{result}` inside iteration child-node inputs
- add focused unit/runtime tests covering both alias styles and
multi-item iteration execution

## Validation
```bash
pytest -q --noconftest \
  test/testcases/test_web_api/test_canvas_app/test_iterationitem_unit.py \
  test/testcases/test_web_api/test_canvas_app/test_iteration_runtime_unit.py \
  test/testcases/test_web_api/test_canvas_app/test_invoke_component_unit.py
```

Result: `12 passed`

Closes #14142

2026-05-12 13:05:21 +08:00

..

test_code_exec_contract_unit.py

Fix: add codeexec attachments output (#14787)

2026-05-11 19:16:33 +08:00

test_invoke_component_unit.py

Feat: support variable interpolation in headers (#13680)

2026-03-18 22:38:20 +08:00

test_iteration_runtime_unit.py

fix(agent): support iteration item aliases in child nodes (#14146)

2026-05-12 13:05:21 +08:00

test_iterationitem_unit.py

fix(agent): support iteration item aliases in child nodes (#14146)

2026-05-12 13:05:21 +08:00

test_list_operations_unit.py

Refa: align list operations and strict mode (#14387)

2026-04-27 19:13:00 +08:00