feat(security): wire signed audit-chain + grantCheck actually denies#189
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…heck actually deny Two decorative controls made real: - #15/#31 — emitScopedTelemetry now writes a TAMPER-EVIDENT chain: each event links to the previous (prevHash→hash via audit-chain.hashRecord) and the head is Ed25519-signed with the device key (chain-head.sig). And it ALWAYS writes (dropped the !scopedConfigured early-return) so governance evidence exists by default, not only once a policy is set. Verified: 2nd.prevHash == 1st.hash, head.sig present. - #18 — grantCheck stopped hardcoding result:{valid:true}. New revocation ledger (revokeGrant/unrevokeGrant, persisted) + checkToolGrant() verdict; mcp callTool now GATES on it (a revoked server:tool is blocked before dispatch with an isError result), and emitToolGrantCheck records the real verdict. Backend + frontend 0. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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#15/#31: tamper-evident Ed25519-signed audit chain, always written (verified: chained + signed). #18: grantCheck enforces revocation, mcp callTool gates on it. Backend+frontend 0. 🤖 Generated with Claude Code