fix(signatures): use data action instead of command_execution (#299)

[antoinemzs]

Proposed changes

• Use the correct data action for sending signatures (changed from command_execution)

Testing Instructions

1. Step-by-step how to test
2. Environment or config notes

Related issues

• Closes fix(signatures): use correct inject execution action for sending signatures #299

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

Further comments

[antoinemzs]

do not merge until OpenAEV-Platform/openaev#6489 is merged

[Filigran-Automation]

🤖 [AI-generated]

Hey @antoinemzs! 👋 Thanks a lot for opening PR #300 — really appreciate the fix! 🙏

I just had a quick look and I think the description could be enhanced a little to help reviewers get through it faster. I haven't changed anything in your description — just a gentle suggestion:

Area	What could help	Suggestion
### Testing Instructions	The section still has the placeholder template text ("1. Step-by-step how to test / 2. Environment or config notes")	Replace it with the concrete steps to verify the data action is used for signatures (e.g. how you reproduced the previous command_execution behaviour and confirmed the fix)
### Checklist	"For bug fix -> I implemented a test that covers the bug" is unchecked	If a regression test was added for this fix, tick it — otherwise a quick note on how the change is covered helps reviewers

The Proposed changes and Closes #299 are clear and helpful — thank you! 🙌

💡 If helpful, the contribution conventions / PR template walk through what to include.

No rush at all — thanks again for contributing to OpenAEV! 🚀