fact-checker

Build a new vertical slice in the hexagonal architecture OUTSIDE-IN — start from the consumer's need (a use-case / acceptance test), let it pull the domain into existence, then implement the adapter. Use when adding any feature. Forces consumer-driven design, port reuse, and a pure core.

Run the blocking quality gate (typecheck + biome + core-purity + tests with coverage + knip dead-code + jscpd duplication) and report. Use before declaring any change done, before a commit, or before opening a PR. Detectors are BLOCKING (greenfield, no debt to absorb) — a finding fails the gate.

Close a work step with a resumable session report. Use at the end of every step/PR so a fresh session can pick up exactly where this one left off. Updates the canonical docs/STATUS.md and appends a dated report under docs/sessions/.

Drive a change through strict red-green-refactor TDD. Use for ANY change to @app/core (domain or use-cases) and any pure logic — write the failing test first, the minimal code to pass, then refactor under green. Enforces the TDD-strict invariant.