# hott/ — Fork-specific HoTT extensions

This directory holds fork-specific content that's not part of the
upstream Lean tree:

- `design/` — architectural decisions, rationale documents, design
  notes for each phase of HoTT primitive additions.
- `tests/` — HoTT-specific test suites (compiled with `LEAN_HOTT=ON`).

Upstream Lean code lives in `../src/` under its normal layout, with
modifications tagged `LEAN4-HTT:` per the locality principle in
`../FORK_STRATEGY.md`.

New HoTT kernel primitives live in `../src/kernel/hott/`.
New HoTT Lean-side APIs live in `../src/Init/HoTT/`.

This directory exists at the repo root because it's outside the upstream
tree — it documents and tests the fork's additions without intermixing
with upstream files.