End-to-end dry-run.yml matrix that includes webhook HMAC verification against a mock server

[miss-yusrah]

Complexity: High (200 points)

Why this matters
dry-run.yml hits Horizon but may not verify webhook signatures. HMAC bugs ship.

Problem
Webhook unit tests exist. dry-run matrix may skip signature verification against a mock receiver.

What "done" looks like

• Mock server job or step verifying HMAC.
• Matrix still covers Horizon.
• Docs.

Scope

• In: dry-run.yml, webhook.ts, docs.
• Out: Dashboard live E2E.

Guidelines

• Key files: .github/workflows/dry-run.yml, src/webhook.ts, docs/USAGE.md
• Watch for: secrets in logs, timing-safe compare, schema version.
• Constraints: Don’t call real dashboard. Mock only.
• Validate: workflow + npm test webhook

PR must include

• HMAC mock in dry-run
• docs
• no secret leaks

[josephamly36-commits]

@josephamly36-commits has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer I can work on this issue
please can you assign me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @josephamly36-commits to this issue.

[joshuaodoh122-hub]

@joshuaodoh122-hub has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hey maintainer, I wish to work on this issue could you please assign it to me?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @joshuaodoh122-hub to this issue.

[drips-wave]

Congratulations, @Rayhab2000! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Rayhab2000: 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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