docs/ci: selfhost bootstrap/exe-first workflows; add ny-llvmc scaffolding + JSON v0 schema validation; plan: unify to Nyash ABI v2 (no backwards compat)

.github/workflows/selfhost-bootstrap.yml

@@ -0,0 +1,50 @@
+name: Selfhost Bootstrap Smoke
+
+on:
+  push:
+    paths:
+      - 'src/**'
+      - 'apps/**'
+      - 'tools/**'
+      - 'docs/**'
+      - 'Cargo.toml'
+      - 'Cargo.lock'
+      - '.github/workflows/selfhost-bootstrap.yml'
+  pull_request:
+    paths:
+      - 'src/**'
+      - 'apps/**'
+      - 'tools/**'
+      - 'docs/**'
+
+jobs:
+  selfhost-bootstrap:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    env:
+      CARGO_TERM_COLOR: always
+      NYASH_DISABLE_PLUGINS: '1'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Rust (stable)
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry and build
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Build (release, cranelift-jit)
+        run: cargo build --release --features cranelift-jit -j 2
+
+      - name: Run bootstrap selfhost smoke
+        run: timeout -s KILL 40s bash tools/bootstrap_selfhost_smoke.sh
+

.github/workflows/selfhost-exe-first.yml

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+name: Selfhost EXE-first (Optional)
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 7 * * *'
+
+jobs:
+  selfhost-exe-first:
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+    env:
+      CARGO_TERM_COLOR: always
+      NYASH_DISABLE_PLUGINS: '1'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Rust (stable)
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry and build
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Install LLVM 18 (llvm-config-18)
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y curl ca-certificates lsb-release wget gnupg python3-pip
+          curl -fsSL https://apt.llvm.org/llvm.sh -o llvm.sh
+          chmod +x llvm.sh
+          sudo ./llvm.sh 18
+          llvm-config-18 --version
+
+      - name: Install llvmlite (Python)
+        run: |
+          python3 -m pip install --upgrade pip
+          python3 -m pip install llvmlite jsonschema
+
+      - name: Build nyash (release)
+        run: cargo build --release -j 2
+
+      - name: ny-llvmc dummy smoke
+        run: |
+          cargo build --release -p nyash-llvm-compiler -j 2
+          ./target/release/ny-llvmc --dummy --out /tmp/dummy.o
+          file /tmp/dummy.o || true
+
+      - name: Run EXE-first smoke (parser EXE + bridge)
+        run: timeout -s KILL 10m bash tools/exe_first_smoke.sh