fix(graph_workflow): report node type value in export_summary

[aayushbaluni]

Summary

export_summary reports node types as "NodeType.AGENT" instead of the enum value "agent", disagreeing with every other serializer in the file.

This is a follow-up to #2017, which consolidated GraphWorkflow's serialization internals and fixed the round-trip bug from #1839. That work switched the node payload helpers to node.type.value and added _parse_node_type for the legacy spelling. One call site was not converted.

The bug

# swarms/structs/graph_workflow.py, export_summary()
"agents": [
    {
        "id": node.id,
        "type": str(node.type),      # -> "NodeType.AGENT"

NodeType is a str Enum, so str(node.type) renders the repr, not the value. Observed on current master:

export_summary types    : ['NodeType.AGENT', 'NodeType.AGENT']
to_json types           : ['agent', 'agent']

Every other serializer emits the value (_node_payload for to_dict/to_spec, and to_json's own node payload), and from_json parses with _parse_node_type. So the same workflow describes its node types two different ways depending on which method you call.

Scope

This is cosmetic, not a functional break. Nothing deserializes a summary, so unlike #1839 it cannot cause a load failure. It matters because it leaks a Python-internal spelling into user-facing output and is inconsistent with the exports, which is exactly the confusion #1839 started from.

The fix is one line, matching the convention already used elsewhere in the file:

"type": node.type.value,

Testing

Added test_export_summary_reports_node_type_value, which asserts the summary reports "agent" and that it agrees with what the deep export writes for the same nodes.

• tests/structs/test_graph_workflow.py: 59 passed, 11 skipped (58 passed before, +1 new)
• Mutation-checked: restoring str(node.type) fails the new test with AssertionError: assert ['NodeType.AGENT', 'NodeType.AGENT'] == ['agent', 'agent'] and leaves the other 58 green, so the test measures the fix rather than decorating it
• black --line-length 70: clean
• ruff check swarms/structs/graph_workflow.py: 236 errors before and 236 after, all pre-existing and unrelated, so this adds none

Closes the residual part of #1839. My earlier PR #1898 is closed as superseded by #2017.

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