Support batched Issue Field updates

Resolve each Project item to its underlying Issue and alias setIssueFieldValue so update_project_items supports attached Issue Fields with partial outcomes.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 1d574277-3735-4356-a753-8354aa6b537c

Author: zwick

README.md

@@ -1133,7 +1133,7 @@ The following sets of tools are available:
   - `status`: The status of the project. Used for 'create_project_status_update' method. (string, optional)
   - `target_date`: The target date of the status update in YYYY-MM-DD format. Used for 'create_project_status_update' method. (string, optional)
   - `title`: The project title. Required for 'create_project' method. (string, optional)
-  - `updated_field`: The field to update and its new value. Required for 'update_project_item' and 'update_project_items'. For 'update_project_items', one top-level field/value applies to every item. Set value to null to clear the field. (object, optional)
+  - `updated_field`: The Project or attached Issue Field to update and its new value. Required for 'update_project_item' and 'update_project_items'. For 'update_project_items', one top-level field/value applies to every item. Set value to null to clear the field. (object, optional)
 
 </details>
 

pkg/github/__toolsnaps__/projects_write.snap

@@ -186,7 +186,7 @@
         "type": "string"
       },
       "updated_field": {
-        "description": "The field to update and its new value. Required for 'update_project_item' and 'update_project_items'. For 'update_project_items', one top-level field/value applies to every item. Set value to null to clear the field.",
+        "description": "The Project or attached Issue Field to update and its new value. Required for 'update_project_item' and 'update_project_items'. For 'update_project_items', one top-level field/value applies to every item. Set value to null to clear the field.",
         "oneOf": [
           {
             "additionalProperties": false,
@@ -209,7 +209,7 @@
             "additionalProperties": false,
             "properties": {
               "name": {
-                "description": "The case-insensitive field name. Supports standard Project fields. Singular 'update_project_item' also supports attached Issue Fields; 'update_project_items' does not.",
+                "description": "The case-insensitive Project or attached Issue Field name.",
                 "type": "string"
               },
               "value": {

pkg/github/projects.go

@@ -548,7 +548,7 @@ func projectUpdatedFieldSchema() *jsonschema.Schema {
 
 	return &jsonschema.Schema{
 		Type:        "object",
-		Description: "The field to update and its new value. Required for 'update_project_item' and 'update_project_items'. For 'update_project_items', one top-level field/value applies to every item. Set value to null to clear the field.",
+		Description: "The Project or attached Issue Field to update and its new value. Required for 'update_project_item' and 'update_project_items'. For 'update_project_items', one top-level field/value applies to every item. Set value to null to clear the field.",
 		OneOf: []*jsonschema.Schema{
 			variant([]string{"id", "value"}, map[string]*jsonschema.Schema{
 				"id": {
@@ -559,7 +559,7 @@ func projectUpdatedFieldSchema() *jsonschema.Schema {
 			variant([]string{"name", "value"}, map[string]*jsonschema.Schema{
 				"name": {
 					Type:        "string",
-					Description: "The case-insensitive field name. Supports standard Project fields. Singular 'update_project_item' also supports attached Issue Fields; 'update_project_items' does not.",
+					Description: "The case-insensitive Project or attached Issue Field name.",
 				},
 			}, "The new value, or null to clear the field. Use a string for TEXT, a finite number for NUMBER, a YYYY-MM-DD string for DATE, and an option name (case-insensitive) or option ID for SINGLE_SELECT."),
 		},