fix(cli): quote Windows shell args for background processes

[simoncrypta]

Summary

• Quote cmd.exe / shell: true arguments in spawnBackgroundProcess so paths with spaces (e.g. CI test project) do not split into truncated MODULE_NOT_FOUND failures
• Escape backslashes per CommandLineToArgvW rules (CodeQL / incomplete escaping)
• Pipe Playwright webServer stderr in smoke configs for clearer failure output

Split out of #2283 so that PR stays focused on @cedarjs/pg local Postgres integration.

Test plan

• Windows CLI / telemetry background spawn with a path containing spaces
• Smoke tests (dev/serve) still start and surface stderr when the webServer fails
• CodeQL no longer flags incomplete escaping on quoteWindowsShellArg

[netlify]

👷 Deploy request for cedarjs pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	7de8222

[nx-cloud]

🤖 Nx Cloud AI Fix

Ensure the fix-ci command is configured to always run in your CI pipeline to get automatic fixes in future runs. For more information, please see https://nx.dev/ci/features/self-healing-ci

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View your CI Pipeline Execution ↗ for commit e2d1b4c

Command	Status	Duration	Result
nx run-many -t build:pack --exclude create-ceda...	✅ Succeeded	1s	View ↗
nx run-many -t build --output-style=stream	✅ Succeeded	2s	View ↗
nx run-many -t test --maxWorkers=4	✅ Succeeded	1m 24s	View ↗
nx run-many -t test:types	✅ Succeeded	10s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-08-05 15:54:52 UTC

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