Test audit

Adapted from the OpenClaw test-audit skill for eve's test tiers and tooling.

Three modes, one value bar. Authoring mode gates every new or changed test at write time. Audit mode runs focused sweeps of tests that re-assert source, duplicate stronger proof, couple behavior to implementation, or keep test-only production seams alive. Continue broad audits as separate coherent follow-up PRs; optimize for confidence, not deletion count. Campaign mode prunes one whole subsystem's test surface (every test file one core area or package owns); before starting one, read CAMPAIGN.md.

Read the root AGENTS.md testing section first. It defines eve's four tiers (unit, integration, scenario, e2e); a test belongs in the tightest tier that can express its assertion.

Authoring gate