[ViperJuice]

Reduce the test matrix from Python 3.10/3.11/3.12 to Python 3.12, as authorized in #390. This removes two full-suite jobs per push or PR. The package requirement remains >=3.10; the owner selected 3.1.0 for the breaking floor change.

Validation: 196 workflow-guard tests passed on Python 3.12; the workflow checker and R22 single-invocation check passed. Both install-smoke and min-version-smoke already use Python 3.12. No release workflow or security guard changes are needed.

Cross-vendor review: required before merge, using phase-loop 0.7.24 and the owner's 2026-10-13 bar. Review round cap: three; unresolved blocking findings halt merge.

See #390.

🤖 Generated with Claude Code

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-14T19:16:16.003829Z	dac969f	PR opened

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