fix: read the license pre-check inputs from the environment

[JarbasAl]

🤖 Auto-generated by Claude Fable 5 (claude-fable-5) via Claude Code — NOT HUMAN-reviewed. Verify before acting.

The combined-license pre-check added in #95 references FAIL_LICENSES and EXCLUDE_LICENSES as Python variables, but they are step environment variables the script never reads, so every license_check run in every consumer repo now fails with NameError before evaluating a single package — observed live on ovos-media-classifier PR #44. The script now reads both from os.environ with empty-string defaults, which restores the intended behaviour of #95 exactly.

This is urgent for the same reason #95 was: consumers pin @dev, so the broken step is live everywhere. One line of scope; no other behaviour changes.

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