ER: Issue templates are missing prerequisite text

### Emergent Requirement - Problem
The Blank Issue Template and Emergent Request template do not have the Prerequisite section at the top of the template body

### Issue you discovered this emergent requirement in
- N/A

### Date discovered
9/7/2026

### Did you have to do something temporarily
- [ ] YES
- [x] NO

### Who was involved
@daras-cu

### What happens if this is not addressed
Individuals who have not completed onboarding may attempt to assign themselves to issues. This will prevent issues from being available to members as they will have to be cleaned up and re-prioritized by merge team/dev leads.

### Resources
- [Example of template with prerequisite section](https://github.com/hackforla/website/issues/new?template=add-github-handle.md)-Compare to the below templates missing this section
- [Blank Issue Template](https://github.com/hackforla/website/issues/new?template=blank-issue-template.md)
- [Emergent Request](https://github.com/hackforla/website/issues/new?template=emergent-request.md)-Missing prerequisite section at top
- [GitHub's template documentation](https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/about-issue-and-pull-request-templates)-General information about templates; note we use .md files for our templates

### Recommended Action Items
- [ ] Make a new issue
- [ ] Discuss with team
- [ ] Let a Team Lead know

### Potential solutions [draft]
- [ ] Create a small issue for each of the Blank Issue and Emergent Request templates to add the following text to the top of the template body:
```
### Prerequisite
1. Be a member of Hack for LA. (There are no fees to join.) If you have not joined yet, please follow the steps on our [Getting Started Page](https://www.hackforla.org/getting-started).
2. Before you claim or start working on an issue, please make sure you have read our [How to Contribute to Hack for LA Guide](https://github.com/hackforla/website/blob/7f0c132c96f71230b8935759e1f8711ccb340c0f/CONTRIBUTING.md).
```
- [ ] Include an action item with these [instructions for template update PRs](https://github.com/hackforla/website/issues/4786#issuecomment-1670584024)

Start by opening the existing add-github-handle.md template linked in the issue, then compare it with blank-issue-template.md and emergent-request.md. Add the specified Prerequisite section at the top of both missing templates and verify that each GitHub issue form displays the onboarding links and instructions correctly.

Written by the indexing model from the issue text.