Chore: Auto-assign the issue when a contributor comments `/assign`

[vib3withsimran]

Feature Description

Relevant files: .github/workflows/ • .github/scripts/moderate-contributions.cjs

Description:

Chore Description

Currently, assignment is fully manual: moderate-contributions.cjs closes PRs that don't reference an issue assigned to the author, but there is no automation to actually assign issues. Contributors must wait for a maintainer to manually assign them before they can open a valid PR.

Motivation / Use Case

Proposed Solution

Add a GitHub Actions workflow (e.g., .github/workflows/auto-assign.yml) that listens to issue_comment events and:

1. Detects a comment containing /assign (case-insensitive, leading-slash).
2. Assigns the commenting user to the issue via github.rest.issues.addAssignees.
3. Comments back confirmation, e.g. @user, you've been assigned! Please open a PR referencing this issue within 7 days.
4. Ignores maintainers / already-assigned issues, and requires commenter to have a valid GitHub account (non-bot).
5. Prevent double-assignment: if someone else is already assigned, reply that the issue is taken.

Alternatives Considered

Acceptance Criteria

• /assign on any open unassigned issue assigns the commenter
• /assign on an assigned issue does not overwrite the assignee
• Reuses the existing moderation patterns/helper style where possible

Additional Context

[github-actions]

Thank you for your contribution! The maintainer will review your issue/PR shortly.

We appreciate your patience.

[CharlieX88]

/claim