fix(annotations): add OpenWorldHint to default UGC issue/PR/discussion tools

Clients that require an explicit boolean (same class of gap as ReadOnlyHint)
cannot treat omitted OpenWorldHint as the spec default of true. Granular
issue/PR tools already declare OpenWorldHint: true; the always-on
counterparts that return or publish issue, PR, review, and discussion
user-generated content did not.

Scope is limited to that default-on UGC surface and does not change search
tools, matching the #1100 decision to postpone a broad OSS rollout.

Co-authored-by: Tiago Vilas Boas <tcarvalhovb@gmail.com>

Author: tiagovilasboas

pkg/github/__toolsnaps__/add_comment_to_pending_review.snap

@@ -1,6 +1,7 @@
 {
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": false,
     "title": "Add review comment to the requester's latest pending pull request review"
   },

pkg/github/__toolsnaps__/add_issue_comment.snap

@@ -1,6 +1,7 @@
 {
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": false,
     "title": "Add comment to issue or pull request"
   },

pkg/github/__toolsnaps__/add_reply_to_pull_request_comment.snap

@@ -1,6 +1,7 @@
 {
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": false,
     "title": "Add reply to pull request comment"
   },

pkg/github/__toolsnaps__/discussion_comment_write.snap

@@ -2,6 +2,7 @@
   "annotations": {
     "destructiveHint": true,
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": false,
     "title": "Manage discussion comments"
   },

pkg/github/__toolsnaps__/get_discussion.snap

@@ -1,6 +1,7 @@
 {
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": true,
     "title": "Get discussion"
   },

pkg/github/__toolsnaps__/get_discussion_comments.snap

@@ -1,6 +1,7 @@
 {
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": true,
     "title": "Get discussion comments"
   },

pkg/github/__toolsnaps__/issue_read.snap

@@ -1,6 +1,7 @@
 {
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": true,
     "title": "Get issue details"
   },

pkg/github/__toolsnaps__/issue_write.snap

@@ -10,6 +10,7 @@
   },
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": false,
     "title": "Create or update issue/pull request"
   },

pkg/github/__toolsnaps__/pull_request_read.snap

@@ -1,6 +1,7 @@
 {
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": true,
     "title": "Get details for a single pull request"
   },

pkg/github/__toolsnaps__/pull_request_review_write.snap

@@ -1,6 +1,7 @@
 {
   "annotations": {
     "idempotentHint": false,
+    "openWorldHint": true,
     "readOnlyHint": false,
     "title": "Write operations (create, submit, delete) on pull request reviews"
   },