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Add FORK_STRATEGY.md documenting: - Purpose: HoTT-compatible kernel extensions (Path types without UIP, transport, HITs) for polytropos's meta-theory. - Why kernel-level: library encodings via Quot leak UIP, incompatible with univalence. Mirrors Cubical Agda's precedent. - Sync strategy: track upstream leanprover/lean4, merge (not rebase), preserve HoTT additions on conflict. - Modification strategy: locality principle (new files under hott/ + src/kernel/hott/ + src/Init/HoTT/); LEAN4-HTT: tag for modifications to upstream files; compile-time feature flag (LEAN_HOTT) gates HoTT. - Patch-series organization for phased primitive additions. - Forbidden moves: no UIP at kernel level, no Quot.sound dependency for HoTT reductions, no Classical.choice in HoTT primitives. Add hott/ directory structure: - hott/README.md describing the fork-specific directory's purpose. - hott/design/ for architectural decisions per phase. - hott/tests/ for HoTT-specific test suites. No kernel modifications in this phase. Subsequent phases: Phase 1: Path + Refl + J primitives Phase 2: transport with computational behavior Phase 3: HIT support Phase 4: cubical primitives if needed Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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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 withLEAN_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.