feat(core,tooling): Windows support — shell selection, install.ps1, win-x64 release package, Windows CI (#79)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/core/test/shell-resolver.test.ts

@@ -0,0 +1,112 @@
+/**
+ * Unit tests for the command-session shell resolver (pure function; platform, env and the
+ * PATH probe are injected — no real shells are spawned here).
+ */
+import { describe, expect, it } from "vitest";
+import { resolveShell } from "../src/environment/tools/command/shell.js";
+
+const POWERSHELL_ARGS = ["-NoLogo", "-NoProfile", "-Command"];
+
+/** A whichAll stub resolving only the given names (value = returned PATH matches). */
+function which(table: Record<string, string[]>): (cmd: string) => string[] {
+  return (cmd) => table[cmd] ?? [];
+}
+
+describe("resolveShell — POSIX", () => {
+  it("uses bash -lc on linux without probing (today's behavior, unchanged)", () => {
+    let probed = false;
+    const shell = resolveShell({
+      platform: "linux",
+      env: {},
+      whichAll: () => {
+        probed = true;
+        return [];
+      },
+    });
+    expect(shell).toEqual({ command: "bash", args: ["-lc"], name: "bash" });
+    expect(probed).toBe(false);
+  });
+
+  it("uses bash -lc on darwin", () => {
+    const shell = resolveShell({ platform: "darwin", env: {} });
+    expect(shell).toEqual({ command: "bash", args: ["-lc"], name: "bash" });
+  });
+});
+
+describe("resolveShell — win32 probing", () => {
+  it("prefers bash on PATH (Git for Windows)", () => {
+    const shell = resolveShell({
+      platform: "win32",
+      env: {},
+      whichAll: which({
+        bash: ["C:\\Program Files\\Git\\bin\\bash.exe"],
+        pwsh: ["C:\\Program Files\\PowerShell\\7\\pwsh.exe"],
+      }),
+    });
+    expect(shell).toEqual({ command: "bash", args: ["-lc"], name: "bash" });
+  });
+
+  it("skips the WSL launcher bash under the system root and falls through to pwsh", () => {
+    const shell = resolveShell({
+      platform: "win32",
+      env: { SystemRoot: "C:\\WINDOWS" },
+      whichAll: which({
+        bash: ["C:\\Windows\\System32\\bash.exe"],
+        pwsh: ["C:\\Program Files\\PowerShell\\7\\pwsh.exe"],
+      }),
+    });
+    expect(shell).toEqual({ command: "pwsh", args: POWERSHELL_ARGS, name: "pwsh" });
+  });
+
+  it("falls back to pwsh when bash is absent", () => {
+    const shell = resolveShell({
+      platform: "win32",
+      env: {},
+      whichAll: which({ pwsh: ["C:\\Program Files\\PowerShell\\7\\pwsh.exe"] }),
+    });
+    expect(shell).toEqual({ command: "pwsh", args: POWERSHELL_ARGS, name: "pwsh" });
+  });
+
+  it("falls back to powershell when neither bash nor pwsh resolve", () => {
+    const shell = resolveShell({ platform: "win32", env: {}, whichAll: which({}) });
+    expect(shell).toEqual({ command: "powershell", args: POWERSHELL_ARGS, name: "powershell" });
+  });
+});
+
+describe("resolveShell — PENGUIN_SHELL override", () => {
+  it("wins on every platform and keeps POSIX-style args for a POSIX shell path", () => {
+    const shell = resolveShell({
+      platform: "linux",
+      env: { PENGUIN_SHELL: "/usr/bin/zsh" },
+    });
+    expect(shell).toEqual({ command: "/usr/bin/zsh", args: ["-lc"], name: "zsh" });
+  });
+
+  it("uses PowerShell-style args when the basename is pwsh (case/extension-insensitive)", () => {
+    const shell = resolveShell({
+      platform: "win32",
+      env: { PENGUIN_SHELL: "C:\\Program Files\\PowerShell\\7\\pwsh.EXE" },
+      whichAll: which({ bash: ["C:\\Program Files\\Git\\bin\\bash.exe"] }),
+    });
+    expect(shell).toEqual({
+      command: "C:\\Program Files\\PowerShell\\7\\pwsh.EXE",
+      args: POWERSHELL_ARGS,
+      name: "pwsh",
+    });
+  });
+
+  it("uses PowerShell-style args for a bare powershell name", () => {
+    const shell = resolveShell({ platform: "win32", env: { PENGUIN_SHELL: "powershell" } });
+    expect(shell).toEqual({ command: "powershell", args: POWERSHELL_ARGS, name: "powershell" });
+  });
+
+  it("uses cmd-style args when the basename is cmd", () => {
+    const shell = resolveShell({ platform: "win32", env: { PENGUIN_SHELL: "cmd" } });
+    expect(shell).toEqual({ command: "cmd", args: ["/d", "/s", "/c"], name: "cmd" });
+  });
+
+  it("ignores a blank PENGUIN_SHELL", () => {
+    const shell = resolveShell({ platform: "linux", env: { PENGUIN_SHELL: "  " } });
+    expect(shell).toEqual({ command: "bash", args: ["-lc"], name: "bash" });
+  });
+});