Append a tech debt entry to a project tech-debt log (docs/tech-debt-log.md) based on the current conversation. Use when: (1) the user says 'add tech debt', 'log tech debt', 'log this as tech debt', 'note this for the tech debt log', '/add-tech-debt', (2) the user wants to record an architectural smell, coding-practice issue, or non-blocking design flaw discovered while working on something else, (3) the user describes a self-healing or workaround-able issue that signals a deeper design mistake worth logging. Triggers on tech debt logging, architectural smell capture, code quality issue recording.