README: truth boundary rewritten to the proven four-tier reality (with
the still-unproven list at equal weight); risk expectations state the
R4 path and the now-openable wallet gate; new sections for the STH
pin store / split-view defense and the dogfood verifier; notebook
course list gains lecture 9 and the ratchet rule; test-runner note.
AGENTS.md gains the operating rules the new subsystems depend on:
boundary tables mirror the repos' buttons (the button is the
authority); observation-vs-verdict for providers; degradation
semantics for partial attestations; the pinning rules (equivocation,
growth-needs-proof, rollback, anchor-root checking); dogfood
provenance/fallback-visibility rules; ML-DSA stays fail-closed; the
mini runner must keep covering the whole suite.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
