fix(gbrain): probe CLI without command builtin

bin/gstack-gbrain-sync.ts

@@ -429,15 +429,6 @@ function constrainSourceId(prefix: string, raw: string): string {
   return tail ? `${prefix}-${tail}-${hash}` : `${prefix}-${hash}`;
 }
 
-function gbrainAvailable(): boolean {
-  try {
-    execSync("command -v gbrain", { stdio: "ignore" });
-    return true;
-  } catch {
-    return false;
-  }
-}
-
 // ── Lock file (D1) ─────────────────────────────────────────────────────────
 
 interface LockInfo {
@@ -529,9 +520,6 @@ async function runCodeImport(args: CliArgs): Promise<StageResult> {
   if (!root) {
     return { name: "code", ran: false, ok: true, duration_ms: 0, summary: "skipped (not in git repo)" };
   }
-  if (!gbrainAvailable()) {
-    return { name: "code", ran: false, ok: false, duration_ms: 0, summary: "skipped (gbrain CLI not in PATH)" };
-  }
 
   const sourceId = deriveCodeSourceId(root);
 

bin/gstack-memory-ingest.ts

@@ -54,7 +54,7 @@ import {
   rmSync,
 } from "fs";
 import { join, basename, dirname } from "path";
-import { execSync, execFileSync, spawnSync, spawn, type ChildProcess } from "child_process";
+import { execFileSync, spawnSync, spawn, type ChildProcess } from "child_process";
 import { homedir } from "os";
 import { createHash } from "crypto";
 
@@ -809,7 +809,6 @@ let _gbrainAvailability: boolean | null = null;
 function gbrainAvailable(): boolean {
   if (_gbrainAvailability !== null) return _gbrainAvailability;
   try {
-    execSync("command -v gbrain", { stdio: "ignore" });
     // Probe `--help` for the `import` subcommand. gbrain v0.20.0+ ships
     // `import <dir>` (batch markdown import via path-authoritative slugs).
     // If absent, we surface a single clean error here rather than failing

lib/gbrain-local-status.ts

@@ -101,13 +101,13 @@ export function resolveGbrainBin(env?: NodeJS.ProcessEnv): string | null {
   if (_gbrainBinCache.has(key)) return _gbrainBinCache.get(key)!;
   let result: string | null = null;
   try {
-    const out = execFileSync("sh", ["-c", "command -v gbrain"], {
+    execFileSync("gbrain", ["--version"], {
       encoding: "utf-8",
       timeout: 2_000,
-      stdio: ["ignore", "pipe", "ignore"],
+      stdio: ["ignore", "ignore", "ignore"],
       env: e,
     });
-    result = out.trim() || null;
+    result = "gbrain";
   } catch {
     result = null;
   }
@@ -266,4 +266,3 @@ export function localEngineStatus(opts: ClassifyOptions = {}): LocalEngineStatus
   writeCache(fresh, key);
   return fresh;
 }
-

test/gbrain-local-status.test.ts

@@ -21,6 +21,7 @@ import { describe, it, expect, beforeEach, afterEach } from "bun:test";
 import {
   mkdtempSync,
   writeFileSync,
+  readFileSync,
   mkdirSync,
   rmSync,
   chmodSync,
@@ -160,6 +161,16 @@ describe("lib/gbrain-local-status — five status cases", () => {
     restoreEnv = null;
   });
 
+  it("probes the gbrain executable directly instead of shelling through command -v", () => {
+    const source = readFileSync(
+      join(import.meta.dir, "..", "lib", "gbrain-local-status.ts"),
+      "utf-8",
+    );
+
+    expect(source).not.toContain('command -v gbrain');
+    expect(source).toContain('execFileSync("gbrain", ["--version"]');
+  });
+
   it("returns 'no-cli' when gbrain is not on PATH", () => {
     env = makeEnv({ withGbrain: false });
     restoreEnv = applyEnv(env);

test/gstack-gbrain-sync.test.ts

@@ -55,6 +55,13 @@ describe("gstack-gbrain-sync CLI", () => {
     expect(r.stderr).toContain("Unknown argument: --bogus");
   });
 
+  it("uses the shared local gbrain status classifier instead of shelling through command -v", () => {
+    const source = readFileSync(SCRIPT, "utf-8");
+
+    expect(source).not.toContain('command -v gbrain');
+    expect(source).toContain("localEngineStatus");
+  });
+
   it("--dry-run with --code-only reports the code import preview only", () => {
     const home = makeTestHome();
     const gstackHome = join(home, ".gstack");

test/gstack-memory-ingest.test.ts

@@ -421,6 +421,13 @@ esac
 }
 
 describe("gstack-memory-ingest writer (gbrain v0.20+ batch `import` interface)", () => {
+  it("probes the gbrain executable directly instead of shelling through command -v", () => {
+    const source = readFileSync(SCRIPT, "utf-8");
+
+    expect(source).not.toContain('command -v gbrain');
+    expect(source).toContain('execFileSync("gbrain", ["--help"]');
+  });
+
   it("invokes `gbrain import <dir> --no-embed --json` exactly once with hierarchical staging", () => {
     const home = makeTestHome();
     const gstackHome = join(home, ".gstack");