Reproducible build verification expansion

[truthixify]

Tier: M (2-4 days) Type: tooling

Context

PR #46 set up the reproducible build pipeline. We need to actually use it: run it weekly, verify the deployed testnet contracts match published attestations, expose the verification status publicly.

Scope

• Weekly GitHub Action that runs the build + verify cycle
• Publishes verification status to a JSON file in the repo (consumable by status pages)
• Slack/Discord webhook on failure
• Public verify.usewraith.xyz page (could be just a GitHub Pages site) showing latest status

Acceptance criteria

• Weekly CI job
• status.json published in the repo
• Webhook config (or doc explaining how to set one up)
• Public status page online or scaffolded

Files to start with

• .github/workflows/stellar-attestation.yml (existing)
• stellar/build/verify.js