Add PR Admin Github workflow to all owned repos

[vredchenko]

On PR in all 4 owned repos add CI/CD which:

• change-detects known paths and enforces appropriate component label (as it does for epuplayer in smartem-devtools)
• adds PR to project board if not already added

[vredchenko]

Prerequisite: Organisation-level PROJECT_TOKEN

The add-to-project job in pr-admin.yml requires a PROJECT_TOKEN secret with access to the organisation's project board.

Current status: Job disabled via if: false until token is configured.

Why org-level?

The token should be set up at the organisation level (or via a GitHub App) rather than tied to an individual contributor's PAT, so that:

• Access doesn't break when a contributor leaves
• Token management is centralised
• Audit trail is clearer

Setup options

1. Org-level secret (recommended): An org admin creates a PAT with project access and adds it as an org secret available to this repo
2. GitHub App: Create an org-owned GitHub App with project permissions (more setup but cleaner long-term)

Required permissions

For fine-grained PAT:

• Repository permissions → Pull requests: Read and write
• Organization permissions → Projects: Read and write

Once configured, re-enable the job by removing the if: false line in .github/workflows/pr-admin.yml.