Update idOS FaceSign docs

[Bbasche]

Summary

• Replaced all FaceVector references with 3D FaceMap (opaque binary blobs) — aligns with FaceTec's current terminology and the "Announcing Log in with idOS FaceSign" blog post
• Removed all audit trail image references — idOS FaceSign does not store or use audit trail images
• Renamed "FaceSign" → "idOS FaceSign" throughout — consistent product branding
• Removed beta designation — 150,000+ users live with Billions, Ready, and Tally
• Added new sections: trust assumptions, security roadmap (attestation logs, execution proofs, MPC), developer integration paths (direct SDK + idOS Relay), and what's stored in the enclave
• Updated SUMMARY.md nav entry from "Biometrics & idOS FaceSign (Beta)" → "idOS FaceSign"

Context

Content aligned with the published blog post: Announcing Log in with idOS FaceSign.

Test plan

• Verify GitBook renders correctly after merge
• Check all internal/external links resolve
• Confirm no remaining FaceVector or audit trail image references

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 2a690fa9-c9d0-4e9d-bf64-4e68eb948e0f

📥 Commits

Reviewing files that changed from the base of the PR and between e114d88 and 0ff4250.

📒 Files selected for processing (2)

• SUMMARY.md
• how-it-works/biometrics-and-idos-facesign-beta.md

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🧪 Generate unit tests (beta)

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Apr 30, 2026 4:45pm