Fix typos and update Black target-version to match Python requirement

[arijitroy003]

Summary

1. CONTRIBUTING.md around line 95: "envoronments" -> "environments"
2. system.py around line 388: "exaclty" -> "exactly"
3. pyproject.toml around line 120: Black target-version is ['py38'] but the project requires Python >=3.10. Change to ['py310'].

Test plan

• Changes are cosmetic/config only — no behavior change
• Verified patterns exist before fixing

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[arijitroy003]

Friendly bump — this has been open for ~12 days. Happy to address any feedback or make changes if needed. Let me know if there's anything I should adjust.