From contract to production behaviour.
Every technical decision receives evidence: a schema, test, log, migration or explicit interface behaviour.
01 · Model and risks
Actors, data, boundaries, dependencies and failures that change the solution are recorded.
02 · Vertical slice
One small flow travels from interface to data and back, testing the architecture early.
03 · Build and tests
Permissions, validation, failures, integrations and migrations are added with tests for real rules.
04 · Operational handoff
Launch, rollback, backups, monitoring and operating notes are verified as delivery work.