Add End-to-End Tests for Task Submission

[Abd-Standard]

Description
Create end-to-end tests covering the complete task submission workflow from creation through successful submission.

Acceptance Criteria
Create a task.
Submit task successfully.
Verify task status updates.
Tests run in CI.

[heymide]

I can take this on. I've gone through the details and will provide a well-tested solution aligned with the project standards.

[success-OG]

Hi Repo Miantainer,

I would like to work on this issue.

I have experience writing end-to-end tests and validating full user workflows, and I’m comfortable ensuring that task creation, submission, and status updates are properly covered and reliable in CI.

I can implement comprehensive tests for the complete task submission flow and make sure they run consistently without flakiness.

Could you please assign this issue to me?

Thank you!

[grantfox-oss]

🦊 GrantFox — @success-OG has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #85)
2. Your PR will be reviewed by the Core-Foundry maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@success-OG's PR #121 was approved and merged by @Abd-Standard.

🏆 @success-OG: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (48 total points). Track your full progress on GrantFox.

👏 Great work, @success-OG! Keep contributing to Core-Foundry.