wip: doctor/cli/docs/api to vector db consolidation; api hardening for descriptions, tenant, and scopes; migrations and conversions of all DALs to EF v10

src/__Libraries/StellaOps.ReachGraph.Persistence/PostgresReachGraphRepository.Tenant.cs

@@ -1,18 +1,10 @@
 // Licensed to StellaOps under the BUSL-1.1 license.
-using Npgsql;
 
 namespace StellaOps.ReachGraph.Persistence;
 
 public sealed partial class PostgresReachGraphRepository
 {
-    private static async Task SetTenantContextAsync(
-        NpgsqlConnection connection,
-        string tenantId,
-        CancellationToken cancellationToken)
-    {
-        await using var command = connection.CreateCommand();
-        command.CommandText = "SELECT set_config('app.tenant_id', @TenantId, false);";
-        command.Parameters.AddWithValue("TenantId", tenantId);
-        await command.ExecuteNonQueryAsync(cancellationToken).ConfigureAwait(false);
-    }
+    // Tenant context is now managed by DataSourceBase.OpenConnectionAsync(tenantId, role).
+    // The base class sets app.tenant_id and app.current_tenant via ConfigureSessionAsync.
+    // No per-repository tenant context setup is needed.
 }