gen.py imported tomllib unconditionally, but that is 3.11+ stdlib only and
graphify supports (and CI tests) 3.10 - so importing tools.skillgen.gen, and
thus collecting test_skillgen.py, crashed the 3.10 test job with
ModuleNotFoundError. Fall back to the tomli backport on <3.11 and add tomli to
the dev group under that marker. Verified the fallback loads and parses with
tomllib forced absent.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
SafiandClaude Opus 4.8
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