feat(api): add error field to PathInfo for stat failures

Cherry-picked from stainless-sdks/hypeman-go preview/feature/hypeman-cp.
Adds Error field to PathInfo to communicate stat failures like permission denied.

Author: rgarcia

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 30
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/kernel%2Fhypeman-962950583e6d0c5e72b547422e3cf0f6b9d00a7be1f1ad0b0430d5e742bf6e20.yml
-openapi_spec_hash: f5a6a0f94dded7dc78ddac6218034bb2
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/kernel%2Fhypeman-28e78b73c796f9ee866671ed946402b5d569e683c3207d57c9143eb7d6f83fb6.yml
+openapi_spec_hash: fce0ac8713369a5f048bac684ed34fc8
 config_hash: f65a6a2bcef49a9f623212f9de6d6f6f

instance.go

@@ -293,6 +293,9 @@ func (r *InstanceNetwork) UnmarshalJSON(data []byte) error {
 type PathInfo struct {
 	// Whether the path exists
 	Exists bool `json:"exists,required"`
+	// Error message if stat failed (e.g., permission denied). Only set when exists is
+	// false due to an error rather than the path not existing.
+	Error string `json:"error,nullable"`
 	// True if this is a directory
 	IsDir bool `json:"is_dir"`
 	// True if this is a regular file
@@ -308,6 +311,7 @@ type PathInfo struct {
 	// JSON contains metadata for fields, check presence with [respjson.Field.Valid].
 	JSON struct {
 		Exists      respjson.Field
+		Error       respjson.Field
 		IsDir       respjson.Field
 		IsFile      respjson.Field
 		IsSymlink   respjson.Field
@@ -402,6 +406,8 @@ type InstanceNewParams struct {
 	Size param.Opt[string] `json:"size,omitzero"`
 	// Number of virtual CPUs
 	Vcpus param.Opt[int64] `json:"vcpus,omitzero"`
+	// Device IDs or names to attach for GPU/PCI passthrough
+	Devices []string `json:"devices,omitzero"`
 	// Environment variables
 	Env map[string]string `json:"env,omitzero"`
 	// Network configuration for the instance