dx-init

Set up the context/ tree the dx- workflow reads and writes. Idempotent by contract: create what's missing, never touch what exists. Re-running is safe.

Scaffold

Create (only if absent) under context/:

foundation/    glossary.md, lessons.md, research/
standards/     global/, frontend/, backend/, testing/
efforts/  changes/  archive/
config/        review-policies/, templates/