fix(sdk): find broker in package-root bin/ without relying on postinstall

packages/sdk/src/broker-path.ts

@@ -90,6 +90,25 @@ function getSdkBinDirs(): string[] {
  return binDirs;
 }
 
+// The `agent-relay` npm tarball ships platform-specific brokers at its
+// top-level `bin/` (not inside `packages/sdk/bin/`). Walk up from the SDK
+// module looking for any ancestor with a `bin/` directory so we can find
+// the binary without depending on postinstall to copy it.
+function getAncestorBinDirs(): string[] {
+ const binDirs: string[] = [];
+ const start = getCurrentModuleDir();
+ if (!start) return binDirs;
+
+ let current = resolve(start);
+ for (let i = 0; i < 6; i++) {
+ addUniquePath(binDirs, join(current, 'bin'));
+ const parent = resolve(current, '..');
+ if (parent === current) break;
+ current = parent;
+ }
+ return binDirs;
+}
+
 function getDevelopmentBinaryPaths(ext: string, binDirs: string[]): string[] {
  const binaryPaths: string[] = [];
  const repoRoots = new Set<string>();
@@ -146,14 +165,18 @@ function getSourceCheckoutBinaryPaths(ext: string, binDirs: string[]): string[]
  * 2. Local Cargo build when the SDK is loaded from an agent-relay source checkout
  * 3. SDK's bin/ directory (resolved via CJS globals, createRequire, or import.meta.url)
  * 4. Platform-specific name (agent-relay-broker-{platform}-{arch}) in bin/
- * 5. Common Cargo development paths (target/release and target/debug)
- * 6. PATH lookup via `which` / `where`
+ * 5. Ancestor bin/ directories (the `agent-relay` tarball ships platform-
+ * specific broker binaries at its package-root `bin/` — finding them
+ * here removes the postinstall copy dependency)
+ * 6. Common Cargo development paths (target/release and target/debug)
+ * 7. PATH lookup via `which` / `where`
  *
  * @returns Absolute path to the broker binary, or null if not found
  */
 export function getBrokerBinaryPath(): string | null {
  const ext = process.platform === 'win32' ? '.exe' : '';
  const binDirs = getSdkBinDirs();
+ const ancestorBinDirs = getAncestorBinDirs();
  const platformSpecific = `${BROKER_NAME}-${process.platform}-${process.arch}${ext}`;
  const override = process.env.BROKER_BINARY_PATH ?? process.env.AGENT_RELAY_BIN;
 
@@ -189,14 +212,28 @@ export function getBrokerBinaryPath(): string | null {
  }
  }
 
- // 4. Common development paths for local Cargo builds.
+ // 4. Ancestor bin/ directories (the agent-relay tarball ships brokers at
+ // its package-root bin/ — exact name first for parity with bundled SDKs,
+ // then platform-specific name for the prebuilt-only case).
+ for (const binDir of ancestorBinDirs) {
+ const exactPath = join(binDir, `${BROKER_NAME}${ext}`);
+ if (existsSync(exactPath)) {
+ return exactPath;
+ }
+ const platformPath = join(binDir, platformSpecific);
+ if (existsSync(platformPath)) {
+ return platformPath;
+ }
+ }
+
+ // 5. Common development paths for local Cargo builds.
  for (const developmentPath of getDevelopmentBinaryPaths(ext, binDirs)) {
  if (existsSync(developmentPath)) {
  return developmentPath;
  }
  }
 
- // 5. PATH lookup
+ // 6. PATH lookup
  try {
  const cmd = process.platform === 'win32' ? 'where' : 'which';
  const result = execFileSync(cmd, [BROKER_NAME], {