feat(decisioning): emit UserWarning for sales-* methods required in v6.0 rc.1#434

bokelley wants to merge 2 commits intomainadcontextprotocol/adcp-client-python:mainfrom

claude/issue-423-advance-validate-platform-sales-warningsadcontextprotocol/adcp-client-python:claude/issue-423-advance-validate-platform-sales-warningsCopy head branch name to clipboard