Add determinism tests for verdict artifact generation and update SHA256 sums script

- Implemented comprehensive tests for verdict artifact generation to ensure deterministic outputs across various scenarios, including identical inputs, parallel execution, and change ordering.
- Created helper methods for generating sample verdict inputs and computing canonical hashes.
- Added tests to validate the stability of canonical hashes, proof spine ordering, and summary statistics.
- Introduced a new PowerShell script to update SHA256 sums for files, ensuring accurate hash generation and file integrity checks.

docs/vex/consensus-api.md

@@ -1,6 +1,23 @@
-# Archived: VEX Consensus API
+# VEX Consensus API (Contract Overview)
 
-This document was consolidated during docs cleanup.
+This document provides a high-level overview of consensus endpoints. The gateway and module dossiers define the authoritative routing, auth, and schema details.
 
-- Canonical guide: `docs/16_VEX_CONSENSUS_GUIDE.md`
-- Module dossier: `docs/modules/vex-lens/architecture.md`
+## Common Headers
+
+- `Authorization: Bearer <token>` (or DPoP where configured)
+- `X-StellaOps-Tenant: <tenantId>` (required)
+
+## Typical Endpoints
+
+- `GET /v1/vex/consensus?artifact=...&advisory=...` — returns a single consensus record (plus conflicts).
+- `GET /v1/vex/conflicts` — list outstanding conflicts with summary metadata.
+- `GET /v1/vex/consensus/export` — deterministic JSONL export for Offline Kit / Export Center bundles.
+- `POST /v1/vex/trust/weights` — tenant-admin update of trust tiers/weights (when enabled).
+
+## Output Shape
+
+See `docs/vex/consensus-json.md` for the record payload reference.
+
+## References
+
+- `docs/modules/vex-lens/architecture.md`