Harden log export CSV and fix profile loader boundary

Load SCIM profile emails via Identities in the export
layer, drop the cross-table join, sanitize formula-leading
cells, and fall back to validated userName when profile email
is missing. Drop redundant gid array casts in LoadByIDs.

Signed-off-by: Cursor Agent <cursoragent@cursor.com>

Co-authored-by: Bryan FRIMIN <bryan@frimin.fr>

pkg/coredata/identity.go

@@ -407,7 +407,7 @@ SELECT
 FROM
     identities
 WHERE
-    id = ANY(@identity_ids::text[])
+    id = ANY(@identity_ids)
 `
 
 	args := pgx.StrictNamedArgs{"identity_ids": identityIDs}