V2: WASI, -r flag, CI pipeline, examples & tests cleanup

WASI / wasm32 target support
- Auto-detect /usr/share/wasi-sysroot on Linux when target starts_with("wasm32")
- Skip -march/-mtune for wasm (clang rejects them)
- Apply -fno-exceptions -fno-c++-static-destructors -mllvm -wasm-enable-sjlj
  -D_WASI_EMULATED_SIGNAL to wasm builds (compile + std PCM, kept in sync)
- .wasm output extension in expectedOutputFor and link command
- EnableWasiBrowserRuntime(cfg): opt-in helper that drops index.html +
  runtime.js next to the .wasm; runtime.js reads window.CRAFTER_WASM_URL
  set in the templated index.html so a single shim handles any output name

-r run flag in the CLI: build then exec the artifact (host targets only;
  rejects libraries; auto .exe/.wasm extension handling)

CI pipeline (.forgejo/workflows/ci.yaml)
- Triggers: PR/push to master + manual dispatch
- Single arch-latest container job: install deps, bootstrap, self-rebuild,
  run tests, cross-compile mingw, package both archives, upload artifacts
- Rolling 'latest' release published only on push/dispatch to master

mingw cross-compile from Linux now works end-to-end:
- ExternalDependency cache key includes target so per-target glslang builds
  don't collide; CMAKE_BUILD_TYPE=Release pinned (otherwise glslang appends
  'd' to lib names and breaks linking); cross-compile cmake flags
  (CMAKE_SYSTEM_NAME=Windows, CMAKE_*_COMPILER_TARGET=...)
- project.cpp accepts --target=<triple>; Linux-only -Wl,--export-dynamic
  and -ldl are gated; mingw glslang skips the standalone exe (its libgcc_eh
  link pulls pthread which mingw doesn't link by default)
- mingw compile uses -femulated-tls so std::__once_callable etc reference
  the same emutls symbols libstdc++ provides
- mingw link auto-adds -lstdc++exp -lpthread

GetCrafterBuildHome() exposed from the Platform module; LoadProject (Linux
+ Windows) now both use it instead of duplicating the resolution.

Examples reorg: hello-world, library, with-module, wasi, tests — each with
its own README. Tests reorg: per-test directory with inner/ fixture, no
shared tests/fixtures/ tree. New Wasi test verifies .wasm magic bytes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.forgejo/workflows/ci.yaml

@@ -0,0 +1,102 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [master]
+  push:
+    branches: [master]
+  workflow_dispatch:
+
+jobs:
+  build-test-release:
+    runs-on: arch-latest
+    steps:
+      - name: Install build dependencies
+        run: |
+          pacman -Sy --noconfirm
+          pacman -S --noconfirm --needed \
+            base-devel git zip tar \
+            clang lld libc++ cmake \
+            mingw-w64-gcc \
+            wasi-libc wasi-libc++ wasi-libc++abi wasi-compiler-rt \
+            nodejs
+          # The container runs as root and the workspace may be owned by a
+          # different uid; tell git not to refuse operations on it.
+          git config --global --add safe.directory '*'
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # Persist the auth token so the 'Update rolling latest tag' step
+          # below can push the tag back via the implicit GITHUB_TOKEN.
+          persist-credentials: true
+
+      - name: Cache glslang clone+build
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/crafter.build/external
+          key: glslang-${{ runner.os }}-v1
+
+      - name: Bootstrap (build.sh)
+        run: ./build.sh
+
+      - name: Self-rebuild via crafter-build (Linux)
+        run: CRAFTER_BUILD_HOME=$PWD/share/crafter-build ./bin/crafter-build
+
+      - name: Run tests
+        run: CRAFTER_BUILD_HOME=$PWD/share/crafter-build ./bin/crafter-build test
+
+      - name: Cross-compile for Windows (mingw32)
+        run: CRAFTER_BUILD_HOME=$PWD/share/crafter-build ./bin/crafter-build --target=x86_64-w64-mingw32
+
+      - name: Package artifacts
+        run: |
+          set -eux
+          mkdir -p dist
+
+          # Linux: bin/, lib/, share/ at archive root
+          stage_lin=$(mktemp -d)
+          mkdir -p "$stage_lin/bin" "$stage_lin/lib"
+          cp bin/crafter-build "$stage_lin/bin/"
+          cp lib/libcrafter-build.a "$stage_lin/lib/"
+          cp -r share "$stage_lin/"
+          tar czf dist/crafter-build-linux-x86_64.tar.gz -C "$stage_lin" .
+
+          # Windows: bin/ contents (exe + auto-bundled mingw DLLs) and share/
+          stage_win=$(mktemp -d)
+          mkdir -p "$stage_win/bin"
+          cp bin/crafter.build-exe-x86_64-w64-mingw32-native/* "$stage_win/bin/"
+          cp -r share "$stage_win/"
+          (cd "$stage_win" && zip -r "$GITHUB_WORKSPACE/dist/crafter-build-windows-x86_64.zip" .)
+
+          ls -la dist/
+
+      - name: Upload workflow artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: crafter-build
+          path: dist/
+          if-no-files-found: error
+
+      - name: Update rolling 'latest' tag
+        if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && github.ref == 'refs/heads/master'
+        run: |
+          git config user.email "ci@catcrafts.net"
+          git config user.name "Crafter Build CI"
+          git tag -f latest
+          git push origin latest --force
+
+      - name: Publish rolling 'latest' release
+        if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && github.ref == 'refs/heads/master'
+        uses: https://code.forgejo.org/actions/forgejo-release@v2
+        with:
+          direction: upload
+          url: ${{ github.server_url }}
+          repo: ${{ github.repository }}
+          tag: latest
+          title: Latest main build
+          prerelease: true
+          override: true
+          release-dir: dist
+          token: ${{ secrets.GITHUB_TOKEN }}