Replace npx tsc with pnpm exec tsc in container entrypoint command,
and npm install -g with pnpm install -g in dynamic Dockerfile
generation. Variable names (npm, npmPackages) intentionally kept as
they refer to npm-registry packages, not the CLI.
Enable corepack and PNPM_HOME in container, switch all npm/npx
invocations to pnpm/pnpm exec. Use wildcard COPY for optional
pnpm-lock.yaml in agent-runner.
meeech