fix(create): don't fail scaffold on pnpm install exit code

[DylanPiercey]

pnpm create marko reported failure even though the project was created fine. Modern pnpm exits non-zero when it skips dependency build scripts (ERR_PNPM_IGNORED_BUILDS, e.g. esbuild), and create treated any non-zero install exit as fatal — so it aborted before git init and printed a bare exited with code 1.

Now a non-zero install is a warning that still completes scaffolding, the package manager's output is shown instead of swallowed (stdio: inherit), and the success message hints to finish install manually when it didn't complete cleanly. Also spawns the child process without an args array under shell: true to fix Node's DEP0190 deprecation warning the CLI was emitting.

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📥 Commits

Reviewing files that changed from the base of the PR and between c66d735 and 7c42906.

📒 Files selected for processing (3)

• packages/create/src/cli.js
• packages/create/src/exec.js
• packages/create/src/index.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dpiercey-ws-cli-create-n9kgdk

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[DylanPiercey]

Folding this into a broader PR on the same branch that also drops the legacy packages (test/serve/build/prettyprint/migrate) and modernizes the CLI tooling. The pristine full-package history is preserved on the new legacy branch.