restore(lang): full lang tree from ff3ef452 (306 files) — compiler, vm, shared, runner, c-abi, etc.\n\n- Restores lang/ directory (files≈306, dirs≈64) as per historical branch with selfhost sources\n- Keeps our recent parser index changes in compiler/* (merged clean by checkout)\n- Unblocks selfhost development and documentation references

lang/src/tools/loader_front/LAYER_GUARD.hako

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+#![doc = "Phase 20.13 loader_front guard — define layer responsibilities."]
+
+static box LOADER_FRONT_GUARD {
+  name() { return "loader_front" }
+  allowed_imports() { return ["json", "env"] }
+  forbidden_imports() { return ["vm_core", "plugins", "ffi"] }
+}
+

lang/src/tools/loader_front/README.md

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+# loader_front — Loader Front EXE (Phase 20.13)
+
+Purpose
+- Decide high-level loading (policy/allowlist/resolution) ahead of kernel loader.
+- Output a short, stable verdict; kernel honors it strictly (no fallback).
+
+Responsibilities
+- Evaluate env/policy and candidate modules.
+- Emit: OK/NOOP/FAIL (tagged), exit code semantics same as runner_front.
+
+Inputs/Outputs
+- Input: JSON/CLI with policy keys and candidates
+- Output: one-line verdict (short) + exit code
+
+ENV (planned; default OFF)
+- HAKO_LOADER_USE_SCRIPT_EXE=1 (alias NYASH_*) — enable loader front EXE
+- HAKO_QUIET=1 — quiet mode adherence
+
+Non‑Goals
+- No filesystem/ABI side-effects beyond read-only inspection.
+
+TTL
+- Diagnostics/formatting migrates from Rust boundary to this front EXE when stable.
+
+Notes (AOT / Single‑EXE)
+- 将来的に単一exeに内蔵（AOT）され、ENV反映→通常ロード継続を同一プロセスで行います。
+- 開発時は tools/front_exe/loader_front.sh をゲートONで差し替え可能です。

lang/src/tools/runner_front/LAYER_GUARD.hako

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+#![doc = "Phase 20.13 runner_front guard — define layer responsibilities."]
+
+static box RUNNER_FRONT_GUARD {
+  name() { return "runner_front" }
+  allowed_imports() { return ["json", "cli", "env"] }
+  forbidden_imports() { return ["vm_core", "llvm", "plugins"] }
+}
+

lang/src/tools/runner_front/README.md

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+# runner_front — Script-built Front EXE (Phase 20.13)
+
+Purpose
+- Decide runner mode and normalize inputs before core execution.
+- Replace Rust-side front logic via a thin, testable EXE (AOT built from Hakorune scripts).
+
+Notes (AOT / Single‑EXE)
+- 本モジュールは将来、単一の hakorune.exe に内蔵（AOT）され、同一プロセス内で呼び出されます。
+- 開発時は tools/front_exe/runner_front.sh をゲートONで差し替え可能（1行契約の互換を維持）。
+
+Responsibilities
+- Parse CLI/ENV relevant to backend/mode/entry.
+- Produce a short verdict and exit code:
+  - OK: adopt decision (prints normalized JSON or token) and exit 0
+  - NOOP: no decision; Rust runner proceeds with legacy path, exit 0
+  - FAIL: stable tag, exit non‑zero (no fallback by design)
+
+Inputs/Outputs (contract)
+- Input: CLI args + ENV (documented below)
+- Output: one short line (OK/NOOP/FAIL + payload or tag) to stdout
+- Exit codes: 0=adopt/noop, 1=fail
+
+ENV (planned; default OFF)
+- HAKO_RUNNER_USE_SCRIPT_EXE=1 (alias NYASH_*) — enable front EXE adoption
+- HAKO_QUIET=1 — silence noisy logs (front adheres to quiet)
+
+Non‑Goals
+- No plugin/ABI routing here (handled downstream)
+- No semantics; runner_front only decides and normalizes
+
+TTL / Removal Plan
+- Runner boundary diagnostics/tags are temporary; migrate to core/front over time.

lang/src/tools/vm_front/LAYER_GUARD.hako

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+#![doc = "Phase 20.13 vm_front guard — define layer responsibilities."]
+
+static box VM_FRONT_GUARD {
+  name() { return "vm_front" }
+  allowed_imports() { return ["json", "env"] }
+  forbidden_imports() { return ["vm_core", "llvm", "plugins", "ffi"] }
+}
+

lang/src/tools/vm_front/README.md

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+# vm_front — VM Front EXE (Phase 20.13; optional)
+
+Purpose
+- Provide light dispatch hints/normalization prior to VM/LLVM execution.
+- Keep semantics in VM/LLVM; vm_front only shapes inputs and rejects invalid cases early.
+
+Responsibilities
+- Normalize callee/method hints; produce OK/NOOP/FAIL (short) with exit code.
+
+Notes (AOT / Single‑EXE)
+- 将来的に単一exeに内蔵（AOT）され、同一プロセスで前段整流を行います。
+- 開発時は tools/front_exe/vm_front.sh をゲートONで差し替え可能です。
+
+Inputs/Outputs
+- Input: small JSON describing callsite/callee
+- Output: one-line verdict (OK/NOOP/FAIL) + exit code
+
+ENV (planned; default OFF)
+- HAKO_VM_USE_SCRIPT_EXE=1 (alias NYASH_*) — enable vm front EXE
+- HAKO_QUIET=1
+
+Non‑Goals
+- No execution, no state, no ABI interaction.
+
+TTL
+- Runner-side formatting will migrate here after stabilization.