Helm Values Audit

Audit a Helm values file against a contract the caller states, and optionally against a second environment. Reports a required path absent or null, so the chart renders with its own default instead; a value whose type is not what was declared, naming the YAML cause where there is one; a value outside a permitted set; a path the contract does not mention, which Helm ignores silently so a typo never surfaces; and a path stated in one environment and not the other.