f6c added template-exists for a save under a taken name. The template
route had no entry for it, so a duplicate save answered 503
outcome-unknown. Map it to 409 and move the SP8 pin.
template-save.mjs captures the org (or one project) as a starter-pack JSON under
<config>/templates/<owner>/<name>.json: copy material and instance credentials
stripped, role credential request lines kept, owner/org/project/agent/root names
replaced by placeholders in free text, at most 8 hires, packs entries {id, version}.
A held credential value in kept text refuses template-secret-suspected naming the
field path. Preview then save with the preview's digest; O_EXCL 0600 write, a
second save refuses.
Bus: template.save/template.list for the owner's CLI cap, .console names for the
owner's Console cap, null in VERB_RIGHTS. CLI: mosaic org template save|list.
Console: GET /api/templates, POST /api/templates/preview, POST /api/templates.
jason.woltje