fix: address PR review feedback for subprocess cleanup and binary resolution

Wrap SDK query loop in try/finally so subprocess cleanup runs on error paths.
Swap Chroma binary check order to try project-level .bin first (common case).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/services/sync/ChromaServerManager.ts

@@ -115,14 +115,15 @@ export class ChromaServerManager {
     try {
       // chromadb package installs a 'chroma' bin entry
       const chromaBinDir = path.dirname(require.resolve('chromadb/package.json'));
-      const chromaBin = path.join(chromaBinDir, 'node_modules', '.bin', isWindows ? 'chroma.cmd' : 'chroma');
-      // Fallback: check project-level .bin
+      // Check project-level .bin first (most common npm/bun installation layout)
       const projectBin = path.join(chromaBinDir, '..', '.bin', isWindows ? 'chroma.cmd' : 'chroma');
+      // Fallback: nested node_modules .bin (rare — pnpm or workspace hoisting)
+      const nestedBin = path.join(chromaBinDir, 'node_modules', '.bin', isWindows ? 'chroma.cmd' : 'chroma');
 
-      if (existsSync(chromaBin)) {
-        command = chromaBin;
-      } else if (existsSync(projectBin)) {
+      if (existsSync(projectBin)) {
         command = projectBin;
+      } else if (existsSync(nestedBin)) {
+        command = nestedBin;
       } else {
         // Last resort: npx with explicit cwd
         command = isWindows ? 'npx.cmd' : 'npx';

src/services/worker/SDKAgent.ts

@@ -141,7 +141,9 @@ export class SDKAgent {
       }
     });
 
-    // Process SDK messages
+    // Process SDK messages — cleanup in finally ensures subprocess termination
+    // even if the loop throws (e.g., context overflow, invalid API key)
+    try {
       for await (const message of queryResult) {
         // Capture or update memory session ID from SDK message
         // IMPORTANT: The SDK may return a DIFFERENT session_id on resume than what we sent!
@@ -271,12 +273,13 @@ export class SDKAgent {
           // Usage telemetry is captured at SDK level
         }
       }
-
-    // Ensure subprocess is terminated after query completes
+    } finally {
+      // Ensure subprocess is terminated after query completes (or on error)
       const tracked = getProcessBySession(session.sessionDbId);
       if (tracked && !tracked.process.killed && tracked.process.exitCode === null) {
         await ensureProcessExit(tracked, 5000);
       }
+    }
 
     // Mark session complete
     const sessionDuration = Date.now() - session.startTime;