fix(live): hash issuerVkey before pool ID comparison

[wcatz]

Summary

• Live tail compared raw 32-byte issuer VKey (64 hex) against 28-byte Blake2b-224 pool ID hash (56 hex) — could never match
• Hashes VKey with Blake2b-224 via ledger.NewBlake2b224 before comparison
• This is why no block notifications (Telegram/Twitter) have fired since the parallel live tail was added

Test plan

• go build clean
• All 69 tests pass
• Koios confirms 16 blocks minted this epoch with zero notifications

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ffba794a-9889-41e7-b115-cb264ca096be

📥 Commits

Reviewing files that changed from the base of the PR and between 134e0a6 and 4584b95.

📒 Files selected for processing (1)

• main.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/live-tail-pool-match

📝 Coding Plan

• Generate coding plan for human review comments

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