pm-requirements-v1

The requirements cycle, turn a strategy statement, a release target and a set of affected surfaces into an evidence-tagged, gated HANDOFF PACKAGE: spec.md, plan.md, data-model.md, contracts/, slices.json, a design gate and a case contract, plus the record that makes all of it auditable. Five phases: P0 context lock (the north-star metric elicited fresh every cycle) → P1 research → P2 strategy → P3 product spec → P4…