6de889a116
Adds sub and scale(-1) overflow examples and an i128-oracle property over
near-limit weights; injecting wrapping_{add,sub,mul,neg} now fails named
tests. context/code/zset.md no longer claims wrapping breaks retraction.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze