docs consolidation work

docs/airgap/staleness-and-time.md

@@ -55,7 +55,7 @@ AirGap Time calculates drift = `now(monotonic) - anchor.issued_at` and exposes:
 
 ## 6. Implementation Notes
 
-- Use `IAirGapTimeStore` for persistence; default implementation relies on Mongo with tenant partitioning.
+- Use `IAirGapTimeStore` for persistence; default implementation relies on PostgreSQL with tenant partitioning.
 - Ensure deterministic JSON serialization (UTC ISO-8601 timestamps, sorted keys).
 - Test vectors located under `src/AirGap/StellaOps.AirGap.Time/fixtures/`.
 - For offline testing, simulate monotonic clock via `ITestClock` to avoid system clock drift in CI.

docs/airgap/vex-raw-migration-rollback.md

@@ -1,6 +1,8 @@
 # VEX Raw Migration Rollback Guide
 
-This document describes how to rollback migrations applied to the `vex_raw` collection.
+> **DEPRECATED:** This document describes MongoDB migration rollback procedures which are no longer used. Excititor now uses PostgreSQL for persistence (Sprint 4400). See `docs/db/SPECIFICATION.md` for current schema and migration procedures.
+
+This document describes how to rollback migrations applied to the `vex_raw` table.
 
 ## Migration: 20251127-vex-raw-idempotency-indexes
 

docs/airgap/vex-raw-schema-validation.md

@@ -1,6 +1,8 @@
 # VEX Raw Schema Validation - Offline Kit
 
-This document describes how operators can validate the integrity of VEX raw evidence stored in MongoDB, ensuring that Excititor stores only immutable, content-addressed documents.
+> **DEPRECATED:** This document describes MongoDB validation procedures which are no longer used. Excititor now uses PostgreSQL for persistence (Sprint 4400). Schema validation is performed via PostgreSQL constraints. See `docs/db/SPECIFICATION.md` for current schema.
+
+This document describes how operators can validate the integrity of VEX raw evidence stored in the database, ensuring that Excititor stores only immutable, content-addressed documents.
 
 ## Overview