Initial draft of technical architect role

Added for visibility. I don't think this is complete, but I think we can
collaboratively come up with a good description.
they need to be more than technical though.  So far you've described an ideal developer (including the ability to explain their work to people without technical skills)

Architects also need to be able to:
* understand the big picture view of a service
* be involved in whole service design
* understand the wider organisational context in which a service exists and be able to make trade-offs between technical and organisational benefits
* understand the roles of the entire team, able to explain, hire and work with team members of any role
* able to understand and engage at a programme level as well as a project level