ci: lint every bundled Python adapter

[aspix2k]

Summary

• run Ruff recursively over the canonical Python adapter directory
• enforce both lint and format commands in the native CI contract
• reject regressions that narrow either gate to one adapter

Verification

• python3 -m unittest scripts.tests.test_ci_contracts
• python3 scripts/ci_contracts.py --check
• ruff check core/src/main/python
• ruff format --check core/src/main/python
• python3 scripts/local_gate.py push
• independent exact-SHA review: CLEAN / GO

No changelog fragment: this only closes a CI coverage gap.