refactor(#190): collapse SDK sync bridge and remove synckit seam

tests/bug-190-bridge-collapse.test.cjs

@@ -0,0 +1,45 @@
+'use strict';
+
+const { test } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const ROOT = path.join(__dirname, '..');
+
+function read(rel) {
+  return fs.readFileSync(path.join(ROOT, rel), 'utf8');
+}
+
+test('bridge collapse removes cjs-sdk-bridge and runtime-bridge-sync seam', () => {
+  const bridgePath = path.join(ROOT, 'get-shit-done', 'bin', 'lib', 'cjs-sdk-bridge.cjs');
+  const runtimeSyncDir = path.join(ROOT, 'sdk', 'src', 'runtime-bridge-sync');
+
+  assert.equal(fs.existsSync(bridgePath), false, 'cjs-sdk-bridge.cjs must be removed');
+  assert.equal(fs.existsSync(runtimeSyncDir), false, 'sdk/src/runtime-bridge-sync must be removed');
+
+  const routers = [
+    'get-shit-done/bin/lib/init-command-router.cjs',
+    'get-shit-done/bin/lib/roadmap-command-router.cjs',
+    'get-shit-done/bin/lib/state-command-router.cjs',
+    'get-shit-done/bin/lib/validate-command-router.cjs',
+    'get-shit-done/bin/lib/verify-command-router.cjs',
+    'get-shit-done/bin/lib/phases-command-router.cjs',
+  ];
+
+  for (const rel of routers) {
+    const src = read(rel);
+    assert.equal(
+      src.includes('cjs-sdk-bridge.cjs'),
+      false,
+      `${rel} must not import cjs-sdk-bridge.cjs`,
+    );
+  }
+
+  const sdkPkg = JSON.parse(read('sdk/package.json'));
+  assert.equal(
+    Object.prototype.hasOwnProperty.call(sdkPkg.dependencies || {}, 'synckit'),
+    false,
+    'sdk/package.json must not include synckit',
+  );
+});