Single Hub component parameterised by hub key. Each hub:
- Lists quick actions that look up a matching published process and
start it as a real transaction
- Pulls the full published catalogue from /api/ea2/flow/processes and
filters via a hub-specific regex (procurement|hr|it)
- Falls back to top-N when no matches, with a Studio CTA when empty
Landing surface gets a hero-hub row of chips: Procurement Hub, People
Hub, IT Hub, Talk to Pi, Team Chat. Same EA2-write doctrine as wizard.
