RevertFact voids the latest fact for a key — a store mutation — but
/api/revert had no step-up gate, while POST /tools required L3. Close the
inconsistency: thread the same *webauthn.PasskeySession into handleRevert
and reject with 403 when a configured session isn't asserted. nil session
(WebAuthn unconfigured) keeps prior behavior — transport-level auth only.
Tests: un-asserted session → 403 and RevertFact not called; asserted → 200.
The RevertFact mock now records its key so the gate assertion is meaningful.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
kami
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