The runner that executes a CLI's stock install command (the environment
without CODEMAN_*, the npm prefix redirect, the bounded process group, the
one install per CLI at a time) moves from cli-registry-routes.ts to
src/cli-install-runner.ts, so the local model install can use the same one.
The route re-exports installEnv and npmGlobalPrefixWritable and behaves as
before; its tests are unchanged.
New in the shared module: an abort signal that kills the process group,
stockInstallCommand() (the compiled stock command, never the clis.json one)
and tryBeginCliInstall(), the one install slot per CLI for both callers.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
