Add flowIn/flowOut Flow attribute pins to every node, displayed in the node header#3048

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Copilot wants to merge 7 commits intodevelopfrom

copilot/add-flow-attribute-type

Commits on Mar 18, 2026

Initial plan
Copilot
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Add FlowAttribute type - no-data attribute for node dependencies

Copilot
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fabiencastan
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Address code review: fix test file handle, improve docstrings and comments

Copilot
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fabiencastan
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Add automatic flowIn/flowOut attributes to all nodes via InternalAttributesFactory

Copilot
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fabiencastan
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Address code review: improve formatting and comments

Copilot
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fabiencastan
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Add compact flowIn/flowOut pins to node header in GraphEditor

Copilot
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fabiencastan
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Commits on Mar 20, 2026

Rename FlowAttribute→Flow, move to _internalAttributes, don't filter None from outputs

Copilot
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fabiencastan
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