v6.2.0

New

• `quant purge` now accepts `--cache-keys` without a path positional. Use it to purge by cache key from CI:
  ```sh
  quant purge --cache-keys "env:test"
  ```
• Path and `--cache-keys` are mutually exclusive; one is required.

Maintenance

• Updates in-range dependencies (`@clack/core`, `@clack/prompts`, `axios`, `eslint`, `nock`, `sinon`).
• Overrides `serialize-javascript` to `^7.0.5` to address transitive vulnerabilities via mocha (GHSA-5c6j-r48x-rmvq, GHSA-qj8w-gfj5-8c6v). `npm audit` now reports zero vulnerabilities.