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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>
19 lines
760 B
Markdown
19 lines
760 B
Markdown
# hott/ — Fork-specific HoTT extensions
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This directory holds fork-specific content that's not part of the
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upstream Lean tree:
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- `design/` — architectural decisions, rationale documents, design
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notes for each phase of HoTT primitive additions.
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- `tests/` — HoTT-specific test suites (compiled with `LEAN_HOTT=ON`).
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Upstream Lean code lives in `../src/` under its normal layout, with
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modifications tagged `LEAN4-HTT:` per the locality principle in
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`../FORK_STRATEGY.md`.
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New HoTT kernel primitives live in `../src/kernel/hott/`.
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New HoTT Lean-side APIs live in `../src/Init/HoTT/`.
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This directory exists at the repo root because it's outside the upstream
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tree — it documents and tests the fork's additions without intermixing
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with upstream files.
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