feat: trigger on issues opened when @cursor in title or body

Extend check-comment.sh to parse issues event payloads; document
issue_comment + issues opened as supported workflow triggers.

Co-authored-by: Cursor <cursoragent@cursor.com>

Readme.md

@@ -27,6 +27,8 @@ name: Cursor Agent
 on:
   issue_comment:
     types: [created]
+  issues:
+    types: [opened]
 
 jobs:
   cursor:
@@ -70,7 +72,7 @@ For playground repos that commit directly to the default branch (no PR workflow)
 
 ## How it works
 
-When someone mentions `@cursor` in a new issue or PR comment:
+When someone mentions `@cursor` in a new issue (title or body), a new issue/PR comment, or similar:
 
 1. The action parses the webhook payload (`GITHUB_EVENT_PATH`) and checks for `@cursor`.
 2. Comments from the `cursor` user are ignored to prevent feedback loops.
@@ -93,6 +95,7 @@ You can ask Cursor to review a PR, refine a feature request, or implement a chan
 
 ## Supported events
 
-- `issue_comment` with `types: [created]` — issue and PR timeline comments (recommended)
+- `issue_comment` with `types: [created]` — issue and PR timeline comments
+- `issues` with `types: [opened]` — new issue if `@cursor` appears in title or body
 
 `pull_request_review_comment` is not enabled by default: Gitea's payload uses a `review` object instead of `comment`, which is easy to get wrong. Open an issue if you need that trigger tested on your Gitea version.