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feat: allow PLAYWRIGHT_CLI_PATH to point directly at cli.js

The official NixOS playwright-driver package keeps cli.js at the package
root rather than under package/, so getDriverCliJs could not resolve it
even with PLAYWRIGHT_DRIVER_PATH set. Add a PLAYWRIGHT_CLI_PATH env var
that points directly at cli.js, bypassing the assumed layout. This
mirrors the existing PLAYWRIGHT_NODEJS_PATH escape hatch for the Node.js
binary.

Closes #575