[P2] Verify header blob for blocks with transactions too #47

Priority: P2 (feature / coverage) · Effort: S (after the DA cache issue)

Problem

pkg/exporters/verifier/verifier.go:223-226: blocks with transactions only verify the data namespace. Their header blobs are never checked, so header-namespace submission failures on those blocks go unnoticed.

Proposed fix

For blocks with transactions, verify both header and data, and record each outcome under its own type label.

Pros / Cons

• ✅ Full coverage of what the tool claims to verify.
• ⚠️ About 2× Celestia calls; do this after the DA-height cache issue, which makes it nearly free. submission_*{type="header"} counts will jump, so mention it in the release notes.