Add Makefile target for insurance pool tests

[Levi-Ojukwu]

Description:

The Makefile has targets for individual contract crates (test-invoice, test-governance, test-distribution) but lacks one specifically for the insurance pool. This makes it inconsistent and requires developers to remember the raw cargo command.

Why it matters: Consistent Makefile targets reduce cognitive load and prevent mistakes.

Acceptance Criteria:

• Add test-insurance target that runs cargo test -p insurance_pool
• Add it to the help target listing
• Follow the existing target format

Relevant Files: Makefile

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[nazteeemba]

Please assign me to this issue

[Robotron2]

I'd like to pick this up.

I'll add a test-insurance target that follows the existing Makefile conventions, wiring it to cargo test -p insurance_pool, and update the help target so it's listed alongside the other contract test commands. I'll also verify the target naming and formatting remain consistent with the rest of the Makefile.

I'm familiar with Rust workspaces and developer tooling, so this should be a straightforward contribution. I can have a PR ready within the day.

[grantfox-oss]

🦊 GrantFox — @Robotron2 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 #418)
2. Your PR will be reviewed by the Invoice-Liquidity-Network 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!

@Robotron2's PR #503 was approved and merged by @Nursca.

🏆 @Robotron2: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (519 total points). Track your full progress on GrantFox.

👏 Great work, @Robotron2! Keep contributing to Invoice-Liquidity-Network.