feat(installer): migrate shims to runtime-managed targets

tests/scripts/install-sh-smoke.test.ts

@@ -0,0 +1,41 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import fs from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { execFile } from 'node:child_process';
+import { promisify } from 'node:util';
+
+const execFileAsync = promisify(execFile);
+const scriptPath = 'install/install.sh';
+
+test('install.sh supports install and reinstall into BB_INSTALL_HOME', { skip: os.platform() === 'win32' ? 'Bash pathing issues on Windows' : false }, async () => {
+  const root = await fs.mkdtemp(path.join(os.tmpdir(), 'bb-install-smoke-'));
+  const installHome = path.join(root, 'home').replace(/\\/g, '/');
+
+  try {
+    await execFileAsync('bash', [scriptPath], {
+      env: { ...process.env, BB_INSTALL_HOME: installHome },
+    });
+    await execFileAsync('bash', [scriptPath], {
+      env: { ...process.env, BB_INSTALL_HOME: installHome },
+    });
+
+    const beadboardShim = path.join(installHome, '.beadboard', 'bin', 'beadboard');
+    const bbShim = path.join(installHome, '.beadboard', 'bin', 'bb');
+    const runtimeMetadata = path.join(installHome, '.beadboard', 'runtime', 'current.json');
+
+    const [beadboardRaw, bbRaw, metadataRaw] = await Promise.all([
+      fs.readFile(beadboardShim, 'utf8'),
+      fs.readFile(bbShim, 'utf8'),
+      fs.readFile(runtimeMetadata, 'utf8'),
+    ]);
+
+    assert.match(beadboardRaw, /runtime\/current\.json/);
+    assert.match(bbRaw, /runtime\/current\.json/);
+    assert.match(metadataRaw, /"runtimeRoot"/);
+    assert.match(metadataRaw, /"installMode"/);
+  } finally {
+    await fs.rm(root, { recursive: true, force: true });
+  }
+});