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IdentityBundle gains ResticRepoPassword (rides existing age-under-R WrapIdentityBundle; custody spike febdc56 proved a recovered value opens the real repo). POST /escrow/stage-secret (withGuest, scopedFromBody) transiently stages the controller-pushed password (0600, atomic, NEVER logged), which the escrow-create ceremony auto-injects then wipes. Adds AttachResticPassword + StagedResticPasswordPath + WipeStagedResticPassword; EscrowStagePath injectable for tests. Tests: bundle carries pw byte-exact + not-in-blob + wrong-R fails closed; stage 0600 + non-secret ack + cross-guest 403 + value-not-in-log. Additive; PBS-K escrow untouched. NOT yet live-validated (supervised ceremony). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6