Fix invalid self.input access in spin complex DAG test

[talsperre]

Summary

• remove invalid self.input reads from non-foreach-body steps in the complex DAG spin test flow
• keep self.input usage only in steps where the step is directly executing a foreach item

Validation

• python -m pytest 'test/unit/spin/test_spin.py::test_simple_flows[complex_dag]' --confcutdir=test/unit/spin --use-latest -q
• pre-commit run --files test/unit/spin/flows/complex_dag_flow.py

[greptile-apps]

Greptile Summary

This PR removes two invalid self.input reads in the complex DAG spin test flow. self.input is only valid inside a step that is the direct body of a foreach dispatch; step_e and step_l are regular/branch steps, so reading self.input there would raise an error or produce undefined behavior in the test harness.

• step_e is reached from the join step step_d (not a foreach body), so self.input is dropped from its print statement.
• step_l is reached via a static parallel branch from step_j (not a foreach body), so the same invalid read is removed.

Confidence Score: 5/5

Safe to merge — the change removes two clearly incorrect attribute reads from a test fixture with no impact on production code.

Both removed self.input accesses were in steps that are never foreach-body steps (step_e follows a join, step_l is a static branch), so the fix is correct and the remaining self.input usages in step_a, step_b, step_c, and step_f are all in proper foreach-body positions.

No files require special attention.

Important Files Changed

Filename	Overview
test/unit/spin/flows/complex_dag_flow.py	Removes invalid self.input accesses from step_e and step_l, which are not foreach-body steps

_{Reviews (2): Last reviewed commit: "Fix invalid self.input access in spin co..." | Re-trigger Greptile}

[talsperre]

Correct behavior:

• self.input should be the actual input value only in direct foreach-body steps, e.g. step_a, step_b, step_c, and step_f.
• step_e is not a foreach-body step; it creates split_e and then starts a foreach.
• step_l is also not a foreach-body step; it is a normal branch after step_j.
• So for step_e/step_l, the test flow should not read self.input at all. It should not expect an actual value, and it should not rely on old None fallback behavior.