start-nvim.sh and start-vim.sh now source a common helper for the
paths, log(), ensure_binary(), and the sample-wiki fixture, so the
fixture lives in exactly one place instead of being duplicated across
both launchers. Each launcher keeps only its editor-specific config
generation. start-nvim.sh also gains the NUWIKI_DEV_NO_SEED guard for
parity with start-vim.sh.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
