The build script chains gen:skill-docs and bun build --compile with &&,
so a doc generation failure (e.g. missing Codex host config, template
error) prevents the browse binary from being compiled. Users end up
with a broken install where setup reports the binary is missing.
Replace && with ; for the two gen:skill-docs steps so they run
independently of the compilation chain. Doc generation errors are still
visible in stderr, but no longer block binary compilation.
Fixes#482
