feat(agents): improve agents flow and smart defaults (#546)

* feat(agents): improve agents flow and smart defaults

* chore(app): filter our hidden templates from picker

* chore(agents): show beta signup url on permission_denied

* adding nanpa

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Co-authored-by: danm <[email protected]>

Author: rektdeckard

.nanpa/agent-hosting-workflow-improvements.kdl

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+minor type="changed" "cleaned up and made hosting workflow more user-friendly. better prompts and logging/error messaging."