fix(pull-requests): align modern text with typed outputs

Use curated output DTOs for modern JSON text while preserving legacy serialization. Cover successful null responses, empty check runs, and Link-header page traversal.

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

Author: SamMorrowDrums

pkg/github/__toolsnaps__/add_comment_to_pending_review.snap

@@ -75,6 +75,7 @@
     "additionalProperties": false,
     "properties": {
       "message": {
+        "description": "Operation result message.",
         "type": "string"
       }
     },

pkg/github/__toolsnaps__/add_comment_to_pending_review_typed.snap

@@ -56,16 +56,16 @@
       {
         "additionalProperties": false,
         "properties": {
-          "id": {
+          "html_url": {
+            "description": "Browser URL.",
             "type": "string"
           },
-          "url": {
+          "id": {
             "type": "string"
           }
         },
         "required": [
-          "id",
-          "url"
+          "id"
         ],
         "type": "object"
       },
@@ -75,32 +75,32 @@
           "comment": {
             "additionalProperties": false,
             "properties": {
-              "id": {
+              "html_url": {
+                "description": "Browser URL.",
                 "type": "string"
               },
-              "url": {
+              "id": {
                 "type": "string"
               }
             },
             "required": [
-              "id",
-              "url"
+              "id"
             ],
             "type": "object"
           },
           "reaction": {
             "additionalProperties": false,
             "properties": {
-              "id": {
+              "html_url": {
+                "description": "Browser URL.",
                 "type": "string"
               },
-              "url": {
+              "id": {
                 "type": "string"
               }
             },
             "required": [
-              "id",
-              "url"
+              "id"
             ],
             "type": "object"
           }

pkg/github/__toolsnaps__/add_reply_to_pull_request_comment.snap

@@ -71,16 +71,16 @@
       {
         "additionalProperties": false,
         "properties": {
-          "id": {
+          "html_url": {
+            "description": "Browser URL.",
             "type": "string"
           },
-          "url": {
+          "id": {
             "type": "string"
           }
         },
         "required": [
-          "id",
-          "url"
+          "id"
         ],
         "type": "object"
       },