TestGuard v0.18.0

Automated weekly release — everything merged since v0.17.0.

Changed

• Merge branch 'main' into dependabot/github_actions/all-actions-d5b8684899
• feat: native Node probes with measured startup savings (#192)
• chore(homebrew): sha256 for v0.17.0 (#191)
• chore(deps): bump actions/cache

Added

• Explicit --runner node-test support for plain JavaScript projects using
  Node's built-in test framework, with native entry-file discovery, fresh
  process confirmations and bounded structured reports. No runner is installed
  and existing automatic runner selection is unchanged.