Development record

`18-ideate.md:203`, with line 198, says a run with a second research store below the checkout root succeeds against the checkout's own store and names the stray one. That holds only with `--public`, and line 96 makes private the default. A run with no store flag from such a subdirectory writes the verdict to the private ideas store and nothing to the checkout's, yet its stderr still says `this verb addressed the checkout's research store` (`internal/surface/cli/ideate.go:146`), beside `stored: private` on stdout.