docs: restore docs/private/roadmap from 7b4908f9 (Phase 20.31)

docs/private/roadmap/phases/phase-33/PLAN.md

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+# Phase‑33 — Execution Plan (Native LLVM AOT)
+
+## Milestones
+
+1) Skeleton & Contract (this phase)
+- Add C ABI header + stub implementation returning NYI
+- CMake project in `c/llvm-native/` without LLVM linkage
+- Document API and error policy; keep defaults unchanged (llvmlite)
+
+2) Minimal Codegen
+- Implement JSON→IR→OBJ for: const i64 / ret / binop / compare+branch
+- Target: Linux x86_64 only; opt-level configurable
+- Add canaries mirroring existing AOT tests (return/binop/if)
+
+3) Linking
+- Implement `.o + libhako_kernel.a → exe`
+- Provide flags for relocation model / LTO (optional)
+- Add canaries to assert rc/last-line parity with VM/llvmlite
+
+4) Packaging & Toggle
+- Provide `--aot-engine native` / `HAKO_AOT_ENGINE=native`, fall back to llvmlite if native unavailable
+- Doc: system LLVM vs. bundled releases; size/perf trade-offs
+
+## Acceptance (Phase 33)
+- C ABI skeleton present and isolated; repository builds unchanged by default
+- Plan/README written; follow-up work scoped to Phase 34+
+