Maintain docs/TECH_DEBT.md, the living list of code-level cleanup that isn't a risk, a shortcut, or an open decision (that's the risk-register skill's job) and isn't a future feature (that's ROADMAP.md's job). Use when a lint/format/style violation slips past an existing gate, a small known cleanup is noticed while working on something else, or a filed item is fixed and needs removing. DO NOT use for anything with a real cost or risk if left unaddressed (use risk-register instead), for aislop baseline findings (already lifecycle-managed in .aislop/baseline.json), or for anything confidential. Triggers: 'add to tech debt', 'log this as cleanup', 'track this lint violation', 'mark tech-debt item #N fixed', 'what's on the tech debt list'.