Fix audit finding F15:
pyproject.toml, reconcile jsonschema version requirement to match the strict contract validator version ==4.26.0, avoiding runtime contract validator rejection when installed via package manager.SESSION_EXECUTION_AUTHORIZATION recorded from user prompt.
pyproject.toml pins jsonschema==4.26.0 matching contract validator runtime expectation.python -m data2dsl_contract_v0.validate --self-test passes.governance-check.bat reports GOV-PASS.