feat: use released Proof x401 SDK

[creatornader]

Summary

• repin the private x401 runtime fixture to @proof.com/x401-node@0.3.0
• add a Proof VC Common verifier bridge that turns accepted credential output into caller-owned x401 evidence
• refresh D134, CLAUDE.md, the Proof thread map, and the demo surface registry

Verification

• pnpm --filter @atrib/integration test -- proof-x401-node-runtime-interop proof-vc-common-x401-interop proof-x401-sdk-compat proof-repo-interop
• pnpm --filter @atrib/integration typecheck
• pnpm --filter @atrib/integration proof-x401-node-runtime-interop -- --require-native-current-spec --require-current-evidence
• pnpm --filter @atrib/integration proof-vc-common-x401-interop -- --require-current-evidence --require-proof-vc-common
• pnpm --filter @atrib/integration x401-proof-sdk-compat -- --require-compatible
• pnpm --filter @atrib/integration proof-repo-interop -- --live-clone --require-runtime-ready
• pnpm doc-sync
• git diff --check