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