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/WindowsViaSsh/WindowsViaSsh.cpp

@@ -0,0 +1,68 @@
+/*
+Crafter® Build
+Copyright (C) 2026 Catcrafts®
+Catcrafts.net
+
+LGPL-3.0-only.
+
+End-to-end Linux→Windows via SSH:
+the inner fixture cross-compiles main.cpp for x86_64-w64-mingw32, the runner
+specified via CRAFTER_BUILD_RUNNER_x86_64_w64_mingw32 scp's it to a Windows
+host (winvm by default) and runs the .exe under cmd.exe via ssh. Gated on:
+  - mingw cross-toolchain installed (x86_64-w64-mingw32-g++)
+  - CRAFTER_TEST_WIN_SSH_HOST env var set
+  - the host reachable via ssh
+*/
+
+import std;
+import Crafter.Build;
+#include "../_shared/TestUtil.h"
+namespace fs = std::filesystem;
+using namespace TestUtil;
+using namespace Crafter;
+
+namespace {
+    bool ToolPresent(std::string_view name) {
+        return std::system(std::format("which {} > /dev/null 2>&1", name).c_str()) == 0;
+    }
+}
+
+int main() {
+    try {
+        const char* hostEnv = std::getenv("CRAFTER_TEST_WIN_SSH_HOST");
+        if (!hostEnv || !*hostEnv) Skip("set CRAFTER_TEST_WIN_SSH_HOST to enable, e.g. winvm");
+        std::string host = hostEnv;
+
+        if (!ToolPresent("x86_64-w64-mingw32-g++")) Skip("mingw cross-toolchain not on PATH");
+
+        std::string probe = std::format("ssh -o BatchMode=yes -o ConnectTimeout=5 {} \"ver\" > /dev/null 2>&1", host);
+        if (std::system(probe.c_str()) != 0) Skip(std::format("ssh {} not reachable", host));
+
+        std::string remoteDir = "C:/temp/crafter-test-winhello";
+        std::string spec = std::format("sshwin:{}:{}", host, remoteDir);
+        ::setenv("CRAFTER_BUILD_RUNNER_x86_64_w64_mingw32", spec.c_str(), 1);
+
+        auto runner = TestRunner::FromEnv("x86_64-w64-mingw32", TestRunner::Local());
+        if (runner.name != std::format("sshwin:{}", host)) {
+            std::println(std::cerr, "FromEnv produced '{}', expected 'sshwin:{}'", runner.name, host);
+            return 1;
+        }
+
+        fs::path src = fs::current_path() / "tests" / "WindowsViaSsh" / "inner";
+        Configuration cfg = LoadFixture("WindowsViaSsh", 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/WindowsViaSsh/inner/main.cpp

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

tests/WindowsViaSsh/inner/project.cpp

@@ -0,0 +1,28 @@
+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 = "winhello-meta";
+    cfg.outputName = "winhello-meta";
+    cfg.target = "x86_64-pc-linux-gnu";
+    cfg.type = ConfigurationType::Executable;
+
+    Test t;
+    t.config.path = "./";
+    t.config.name = "winhello";
+    t.config.outputName = "winhello";
+    t.config.target = "x86_64-w64-mingw32";
+    t.config.type = ConfigurationType::Executable;
+    std::array<fs::path, 0> ifaces = {};
+    std::array<fs::path, 1> impls = { "main" };
+    t.config.GetInterfacesAndImplementations(ifaces, impls);
+
+    t.runner = TestRunner::FromEnv(t.config.target);
+
+    cfg.tests.push_back(std::move(t));
+    return cfg;
+}

tests/WindowsViaSsh/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/WindowsViaSsh/";
+    cfg.name = "WindowsViaSsh";
+    cfg.outputName = "WindowsViaSsh";
+    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 = { "WindowsViaSsh" };
+    cfg.GetInterfacesAndImplementations(ifaces, impls);
+    return cfg;
+}