fix: fix: vault_request RETURN trap fires prematurely when vault-env.sh is sourced (#773)

lib/action-vault.sh

@@ -128,7 +128,6 @@ vault_request() {
   # Validate TOML content
   local tmp_toml
   tmp_toml=$(mktemp /tmp/vault-XXXXXX.toml)
-  trap 'rm -f "$tmp_toml"' RETURN
 
   printf '%s' "$toml_content" > "$tmp_toml"
 
@@ -150,6 +149,9 @@ vault_request() {
   # Restore caller's FORGE_TOKEN after validation
   FORGE_TOKEN="${_saved_forge_token:-}"
 
+  # Set trap AFTER sourcing vault-env.sh to avoid RETURN trap firing during source
+  trap 'rm -f "$tmp_toml"' RETURN
+
   # Run validation
   if ! validate_vault_action "$tmp_toml"; then
     echo "ERROR: TOML validation failed" >&2