v6.1.0

The create flow stops dead-ending at run dev and points you to the web to
host, template source resolves whichever path the catalog listed, and the
links the server hands back ride the exact corpus commit it built from.

Added

• extension_create signposts the web deploy. The result now carries a
  deployUrl and a closing next step that says the scaffold runs locally and
  where to open the template on the web to host it, so the local scaffold no
  longer stops at run dev with nowhere to ship.
• extension_create names the template it chose. When no template is
  passed the response now discloses the silent default instead of quietly
  scaffolding TypeScript, and points at extension_list_templates to pick
  another.

Fixed

• extension_get_template_source resolves listed paths. A file listed
  with a leading public/<slug>/ or examples/<slug>/ prefix now strips to
  the slug relative path both hosts actually serve, so passing back a listed
  path no longer 404s.
• extension_list_templates keeps the vanilla template filterable. The
  relabel no longer drops the framework key the filter reads.
• extension_add_feature links ride the pinned corpus. Feature links now
  point at the pinned corpus commit instead of floating on main.