Development record

spec close --production-mode carries the shared productionModeFlagHelp, 'how this record's text was produced ... (default: the repo's declared mode, else hand-written)' (internal/surface/cli/cli.go:3350, wired at cli.go:3930, docs/reference/cli/commands.md:4773). On spec close the flag only stamps the follow-on spec that --remainder mints, and without --remainder it is refused with exit 2 (cli.go:3813-3815). The flag help says neither.