test(issues): bound encoded schema parity registration work

Reuse immutable HTTP comparison servers and the SDK schema cache across the full parity matrix. Refresh inherited user timestamp descriptions in issue snapshots.

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

Author: SamMorrowDrums

pkg/github/__toolsnaps__/issue_read.snap

@@ -377,6 +377,7 @@
                     "type": "string"
                   },
                   "created_at": {
+                    "description": "Account creation time in RFC3339 format.",
                     "type": "string"
                   },
                   "email": {
@@ -416,6 +417,7 @@
                     "type": "string"
                   },
                   "updated_at": {
+                    "description": "Last profile update time in RFC3339 format.",
                     "type": "string"
                   }
                 },
@@ -550,6 +552,7 @@
                       "type": "string"
                     },
                     "created_at": {
+                      "description": "Account creation time in RFC3339 format.",
                       "type": "string"
                     },
                     "email": {
@@ -589,6 +592,7 @@
                       "type": "string"
                     },
                     "updated_at": {
+                      "description": "Last profile update time in RFC3339 format.",
                       "type": "string"
                     }
                   },
@@ -960,6 +964,7 @@
                       "type": "string"
                     },
                     "created_at": {
+                      "description": "Account creation time in RFC3339 format.",
                       "type": "string"
                     },
                     "email": {
@@ -999,6 +1004,7 @@
                       "type": "string"
                     },
                     "updated_at": {
+                      "description": "Last profile update time in RFC3339 format.",
                       "type": "string"
                     }
                   },

pkg/github/__toolsnaps__/sub_issue_write.snap

@@ -374,6 +374,7 @@
                 "type": "string"
               },
               "created_at": {
+                "description": "Account creation time in RFC3339 format.",
                 "type": "string"
               },
               "email": {
@@ -413,6 +414,7 @@
                 "type": "string"
               },
               "updated_at": {
+                "description": "Last profile update time in RFC3339 format.",
                 "type": "string"
               }
             },