feat(context): add recall fusion and zvec workspace adapters

Introduce RRF-based recall fusion for personal/episodic/temporal paths,
zvec-grep workspace shadow probing for code executors, and a local
headroom proxy starter aligned with the fusion plan defaults.

Co-authored-by: Cursor <cursoragent@cursor.com>

tool-gateway.mjs

@@ -8,6 +8,10 @@ import {
   parseCursorAgentUsage,
 } from './cursor-agent-usage.mjs';
 import { resolveExecutorDisplayLabel } from './executor-display-label.mjs';
+import {
+  searchZvecWorkspace,
+  shouldAttachZvecWorkspaceForTask,
+} from './memind-zvec-workspace.mjs';
 
 const BASE_CODE_EXECUTORS = ['aider', 'openhands'];
 
@@ -226,6 +230,22 @@ export function createToolGateway({
       throw new Error('Tool Gateway job missing instruction');
     }
     const executor = selectExecutor({ userMessage, taskType });
+    const normalizedTaskType = String(taskType ?? userMessage?.metadata?.memindRun?.taskType ?? '').trim();
+    let zvecWorkspace = null;
+    if (shouldAttachZvecWorkspaceForTask(normalizedTaskType, env)) {
+      zvecWorkspace = searchZvecWorkspace({
+        query: instruction,
+        cwd,
+        env,
+      });
+      if (zvecWorkspace.mode === 'shadow' && zvecWorkspace.hitCount > 0) {
+        console.log('[tool-gateway] zvec workspace shadow', {
+          taskType: normalizedTaskType,
+          hitCount: zvecWorkspace.hitCount,
+          top: zvecWorkspace.hits[0],
+        });
+      }
+    }
     const receiptPath = executor === 'aider'
       ? resolveAiderReceiptPath(userMessage, requestId)
       : null;
@@ -274,6 +294,7 @@ export function createToolGateway({
         runId,
         requestId,
         userId,
+        zvecWorkspace,
       };
     }
 
@@ -330,6 +351,7 @@ export function createToolGateway({
             displayStdout: displayStdout || undefined,
             usage: usage ?? undefined,
             stderr,
+            zvecWorkspace,
           });
           return;
         }