Add electronic signature

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

go.mod

@@ -13,9 +13,11 @@ require (
 	github.com/chromedp/cdproto v0.0.0-20250803210736-d308e07a266d
 	github.com/chromedp/chromedp v0.14.2
 	github.com/crewjam/saml v0.5.1
+	github.com/digitorus/timestamp v0.0.0-20250524132541-c45532741eea
 	github.com/elimity-com/scim v0.0.0-20240320110924-172bf2aee9c8
 	github.com/go-chi/chi/v5 v5.2.4
 	github.com/go-chi/cors v1.2.2
+	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.8.0
 	github.com/jhillyerd/enmime v1.3.0
 	github.com/modelcontextprotocol/go-sdk v1.2.0
@@ -29,7 +31,7 @@ require (
 	github.com/yuin/goldmark v1.7.16
 	go.gearno.de/crypto/uuid v0.1.1-0.20251208105319-3f587312a712
 	go.gearno.de/kit v0.1.1
-	go.gearno.de/x/ref v0.0.0-20240502200927-d74926fcb14c
+	go.gearno.de/x/ref v0.0.0-20260216110753-a700c951377c
 	go.opentelemetry.io/otel v1.39.0
 	go.opentelemetry.io/otel/trace v1.39.0
 	go.probo.inc/mcpgen v0.0.0-20251124210642-41a5174eb92f
@@ -66,6 +68,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/di-wu/parser v0.3.0 // indirect
 	github.com/di-wu/xsd-datetime v1.0.0 // indirect
+	github.com/digitorus/pkcs7 v0.0.0-20230713084857-e76b763bdc49 // indirect
 	github.com/dnephin/pflag v1.0.7 // indirect
 	github.com/fatih/color v1.18.0 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
@@ -82,7 +85,6 @@ require (
 	github.com/google/jsonschema-go v0.4.2 // indirect
 	github.com/google/s2a-go v0.1.9 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
-	github.com/google/uuid v1.6.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.9 // indirect
 	github.com/googleapis/gax-go/v2 v2.16.0 // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect