Add Test Coverage Reporting Gate to CI

[maugauwi-hash]

Area: Testing & Quality
Priority: Low
Estimated Time: 1.5 hours

Description:
Neither android-ci.yml nor ios-ci.yml appears to enforce a minimum coverage threshold, so
coverage could silently erode as new features are added without corresponding tests.

Tasks:

• Add coverage reporting (JaCoCo for Android, xccov/llvm-cov for iOS) to both CI workflows
• Set an initial threshold at or near current coverage, ratcheting up over time rather than starting
  strict enough to block unrelated PRs
• Surface the coverage delta as a PR comment or check annotation

[Danielobito009]

@Danielobito009 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I’m free and would love to work on this issue and get it done soonest

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[Dev-ElvisTobi]

@Dev-ElvisTobi has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Can I work on this ?

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[Sankai2003]

@Sankai2003 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello! This issue aligns well with my skills, and I'm confident I can implement a clean and effective solution. I'd appreciate it if you could assign it to me. Thank you!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Sankai2003 to this issue.

[leofoxcode-oss]

@leofoxcode-oss has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hello maintainer, can i work on this issue

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[drips-wave]

Congratulations, @leofoxcode-oss! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @leofoxcode-oss: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@leofoxcode-oss's PR #361 was approved and merged by @maugauwi-hash.

🏆 @leofoxcode-oss: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (344 total points). Track your full progress on GrantFox.

👏 Great work, @leofoxcode-oss! Keep contributing to ethos-protocol.