docs: spec cleanup — Layer 5 wording, Layer 3 banner, Layer 6 superseded
Layer 5: replace two priv_post references in author-direct fast path with the correct per-V_x CEK + priv_x lookup. Cache/prefilter logic unchanged. Layer 3: replace the "partially superseded" warning banner with a plain scope note explaining the Mode 1/Mode 2 distinction reduces to "body encrypted vs body plaintext"; wrap-slot canonical form lives in Layer 2. Layer 6: mark as superseded by Layer 4. README updated to match. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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# Layer 6 — Revocation & Rotation Cascades
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**Status**: Stub. May not be in v1. Drafted for design review only.
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**Status**: **Superseded by [Layer 4](layer-4-keypair-rotation.md) (2026-05-13).** Layer 4 settled the revocation and cascade design: V_me rotation as the persona-wide revocation primitive, receiver-chain storage, grandfather-by-default with author-opt-in per-post cascades, and the optional `KeyBurnDiff` primitive for leaked-V_me scenarios. Nothing in Layer 6 below is load-bearing; this file is retained as a record of the alternatives that were considered before Layer 4 was written.
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**Scope**: Mechanism for a persona to un-vouch a specific vouchee without rotating `V_me` (which affects everyone), and for cascading rotations when a down-chain vouchee is un-vouched.
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**Original scope (now resolved by Layer 4)**: Mechanism for a persona to un-vouch a specific vouchee without rotating `V_me` (which affects everyone), and for cascading rotations when a down-chain vouchee is un-vouched.
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