content(blog): reconcile attest-demo CTAs to what the user actually sees — recomputability, not a flip

This is a live, recomputable drift receipt — the on-chip proof of where this commit's work landed (in its authorized domain, out of it, or unplaced), sealed with a signature anyone can verify. It is the same receipt shipped in the on-commit email, hosted here so the claim is checkable on the open web. The full receipt (attestation, density panel, full commit message) publishes at /commit/8e7a55c46/ shortly after the commit lands.