feat: persist CLI startup defaults

[hebo6]

Summary

• load persistent CLI startup defaults from an XDG-compatible configuration file
• apply configured options to automatic daemon startup and explicit start commands
• preserve command-line precedence over configuration values
• document the configuration path and format

Testing

• npm run format
• npm run build
• npm run test tests/cli-config.test.ts
• npm run test tests/e2e/chrome-devtools-start-stop.test.ts
• npm run test tests/e2e/chrome-devtools-commands.test.ts
• full test suite with local Chromium, with one unrelated request-header ordering snapshot mismatch

Fixes #2388

[google-cla]

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