#4564 Extension versions: print one spelling in log output (drop the v prefix in list, outdated, update, search)

Follow-up split out of #4520. After #4520, every version spelling swamp prints is accepted back as an argument, but the display is still inconsistent: extension list, outdated, update and search print the version with a v prefix (src/presentation/renderers/extension_list.ts, extension_outdated.ts, extension_update.ts, extension_search.tsx), while pull, push, info, every JSON payload and the manifest use the bare CalVer form. Proposal: drop the v prefix in those four log renderers so swamp prints one spelling, and update the swamp extension list example in design/primitives/extensions.md. JSON output is unchanged. This changes existing log output, which is why it was kept out of #4520.