Add a secure repository Prompts review surface and prompt metadata API

Hop-State: A_06FN6MRSHG4B64ZV13086G8
Hop-Proposal: R_06FN6MQDE14FFNR65H1D28G
Hop-Task: T_06FN6J8ECE1Z9XQ5PQ3Z3D8
Hop-Attempt: AT_06FN6J8ECC1SC794JMZ0TF8

services/control-plane/internal/ids/ids.go

@@ -9,6 +9,14 @@ import (
 var encoding = base32.NewEncoding("0123456789ABCDEFGHJKMNPQRSTVWXYZ").WithPadding(base32.NoPadding)
 
 func Repository() (string, error) {
+	return newID("RP_")
+}
+
+func Prompt() (string, error) {
+	return newID("PM_")
+}
+
+func newID(prefix string) (string, error) {
 	value := make([]byte, 16)
 	milliseconds := uint64(time.Now().UnixMilli())
 	value[0] = byte(milliseconds >> 40)
@@ -20,5 +28,5 @@ func Repository() (string, error) {
 	if _, err := rand.Read(value[6:]); err != nil {
 		return "", err
 	}
-	return "RP_" + encoding.EncodeToString(value), nil
+	return prefix + encoding.EncodeToString(value), nil
 }

services/control-plane/internal/ids/ids_test.go

@@ -21,3 +21,13 @@ func TestRepository(t *testing.T) {
 		t.Fatal("generated duplicate IDs")
 	}
 }
+
+func TestPrompt(t *testing.T) {
+	id, err := Prompt()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.HasPrefix(id, "PM_") || len(id) != 29 {
+		t.Fatalf("unexpected prompt ID %q", id)
+	}
+}