[Infra] GitHub Actions triage pipeline for community issues

[Z-M-Huang]

User Story

As a project maintainer, I want new community issues automatically categorized and checked for duplicates so that the backlog stays manageable as the community grows.

Problem

As VCP gains contributors, manual issue triage will become a bottleneck. Auto-labeling and duplicate detection keeps the backlog organized and reduces maintainer burden.

Investigation

GitHub Actions can:

• Trigger on new issue creation
• Read issue body and apply labels based on content
• Search existing issues for potential duplicates
• Comment with links to related issues or existing standards

Scope

GitHub Actions workflow for issue management. This covers:

• Auto-labeling by category (security, architecture, code quality, etc.)
• Duplicate detection with comment linking
• Linking to relevant existing VCP standards

Out of scope: PR review automation, CI/CD for standards validation.

Acceptance Criteria

• Workflow triggers on new issues
• Auto-labels by category (security, architecture, code quality, etc.)
• Checks for potential duplicates and comments with links
• Links to relevant existing VCP standards if applicable