The shape-only heuristic ('any 12 consecutive lowercase 3-8-char words')
matched ordinary prose — including the node's own system prompt — and
blocked 100% of live cloud chat turns (found on dev3, the first real
Claude call through this screen; log: kind=bip39-word-run every turn).
Membership in the crate's own bip39 English wordlist (already a dep via
seed.rs) distinguishes prose from seed material: glue words break runs,
real seeds are nothing but members. Regression test pins the real system
prompt + a clean wire body to Allow; the 12-word genuine-seed case still
blocks. 13/13 egress tests green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
