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>

tests/QemuUser/QemuUser.cpp

@@ -0,0 +1,58 @@
+/*
+Crafter® Build
+Copyright (C) 2026 Catcrafts®
+Catcrafts.net
+
+LGPL-3.0-only.
+*/
+
+import std;
+import Crafter.Build;
+#include "../_shared/TestUtil.h"
+namespace fs = std::filesystem;
+using namespace TestUtil;
+using namespace Crafter;
+
+namespace {
+    std::string PickQemu() {
+        if (const char* v = std::getenv("CRAFTER_TEST_QEMU"); v && *v) return v;
+        return "qemu-x86_64";
+    }
+    bool QemuPresent(const std::string& qemu) {
+        return std::system(std::format("which {} > /dev/null 2>&1", qemu).c_str()) == 0;
+    }
+}
+
+int main() {
+    try {
+        std::string qemu = PickQemu();
+        if (!QemuPresent(qemu)) Skip(std::format("{} not on PATH", qemu));
+
+        std::string spec = std::format("cmd:{}", qemu);
+        ::setenv("CRAFTER_BUILD_RUNNER_x86_64_pc_linux_gnu", spec.c_str(), 1);
+
+        // Verify env-var translation independently of RunTests.
+        auto runner = TestRunner::FromEnv("x86_64-pc-linux-gnu", TestRunner::Local());
+        if (runner.name != spec) {
+            std::println(std::cerr, "FromEnv produced '{}', expected '{}'", runner.name, spec);
+            return 1;
+        }
+
+        fs::path src = fs::current_path() / "tests" / "QemuUser" / "inner";
+        Configuration cfg = LoadFixture("QemuUser", src);
+        RunTestsOptions opts;
+        TestSummary summary = RunTests(cfg, opts);
+
+        if (summary.passed != 1 || summary.failed != 0 || summary.crashed != 0 ||
+            summary.timedOut != 0 || summary.skipped != 0) {
+            std::println(std::cerr,
+                "outcome counts mismatch: passed={} failed={} crashed={} timedOut={} skipped={}",
+                summary.passed, summary.failed, summary.crashed, summary.timedOut, summary.skipped);
+            return 1;
+        }
+        return 0;
+    } catch (const std::exception& e) {
+        std::println(std::cerr, "test exception: {}", e.what());
+        return 1;
+    }
+}

tests/QemuUser/inner/project.cpp

@@ -0,0 +1,27 @@
+import std;
+import Crafter.Build;
+namespace fs = std::filesystem;
+using namespace Crafter;
+
+extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
+    Configuration cfg;
+    cfg.path = "./";
+    cfg.name = "qemu-meta";
+    cfg.outputName = "qemu-meta";
+    cfg.target = "x86_64-pc-linux-gnu";
+    cfg.type = ConfigurationType::Executable;
+
+    Test t;
+    t.config.path = "./";
+    t.config.name = "Hello";
+    t.config.outputName = "Hello";
+    t.config.target = "x86_64-pc-linux-gnu";
+    t.config.type = ConfigurationType::Executable;
+    std::array<fs::path, 0> ifaces = {};
+    std::array<fs::path, 1> impls = { "tests/Hello" };
+    t.config.GetInterfacesAndImplementations(ifaces, impls);
+    t.runner = TestRunner::FromEnv(t.config.target);
+    cfg.tests.push_back(std::move(t));
+
+    return cfg;
+}

tests/QemuUser/inner/tests/Hello.cpp

@@ -0,0 +1,6 @@
+import std;
+
+int main() {
+    std::println("hello-from-qemu");
+    return 0;
+}

tests/QemuUser/project.cpp

@@ -0,0 +1,20 @@
+import std;
+import Crafter.Build;
+namespace fs = std::filesystem;
+using namespace Crafter;
+
+extern "C" Configuration CrafterBuildProject(std::span<const std::string_view>) {
+    Configuration cfg;
+    cfg.path = "tests/QemuUser/";
+    cfg.name = "QemuUser";
+    cfg.outputName = "QemuUser";
+    cfg.target = "x86_64-pc-linux-gnu";
+    cfg.type = ConfigurationType::Executable;
+    cfg.dependencies = { ParentLib("crafter.build-lib") };
+    cfg.linkFlags.push_back("-Wl,--export-dynamic");
+    cfg.linkFlags.push_back("-ldl");
+    std::array<fs::path, 0> ifaces = {};
+    std::array<fs::path, 1> impls = { "QemuUser" };
+    cfg.GetInterfacesAndImplementations(ifaces, impls);
+    return cfg;
+}