fix(launcher): resolve remote Bun path for sync

launcher/sync/ssh.test.ts

@@ -1,6 +1,9 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import { assertSafeSshHost, runScp, shellQuote } from './ssh.js';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { assertSafeSshHost, resolveRemoteSubminerCommand, runScp, shellQuote } from './ssh.js';
 
 test('assertSafeSshHost rejects option-like hosts', () => {
   assert.throws(() => assertSafeSshHost('-oProxyCommand=touch pwned'), /looks like an option/);
@@ -29,3 +32,30 @@ test('runScp rejects option-like remote host components', () => {
     /SSH host that looks like an option/,
   );
 });
+
+test('resolveRemoteSubminerCommand verifies the launcher under the remote runtime PATH', () => {
+  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-ssh-test-'));
+  const sshPath = path.join(tempDir, 'ssh');
+  const originalPath = process.env.PATH;
+  fs.writeFileSync(
+    sshPath,
+    `#!/bin/sh
+case "$2" in
+  *'$HOME/.local/bin'*'$HOME/.bun/bin'*'/opt/homebrew/bin'*'/usr/local/bin'*'/usr/bin'*'/bin'*'subminer --help'*) exit 0 ;;
+  *) exit 1 ;;
+esac
+`,
+    { mode: 0o755 },
+  );
+
+  try {
+    process.env.PATH = `${tempDir}:${originalPath ?? ''}`;
+    assert.equal(
+      resolveRemoteSubminerCommand('macbook', null),
+      'PATH="$HOME/.local/bin:$HOME/.bun/bin:/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin:$PATH" subminer',
+    );
+  } finally {
+    process.env.PATH = originalPath;
+    fs.rmSync(tempDir, { recursive: true, force: true });
+  }
+});

launcher/sync/ssh.ts

@@ -71,23 +71,27 @@ export function shellQuote(value: string): string {
   return `'${value.replaceAll("'", `'\\''`)}'`;
 }
 
+const REMOTE_RUNTIME_PATH =
+  'PATH="$HOME/.local/bin:$HOME/.bun/bin:/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin:$PATH"';
+
 /**
- * Non-interactive SSH shells often miss ~/.local/bin in PATH, so probe the
- * configured command first and fall back to the default install location.
+ * Non-interactive SSH shells often miss user-installed launchers and Bun.
+ * Probe the launcher under the same deterministic PATH used by sync itself.
  */
 export function resolveRemoteSubminerCommand(host: string, preferred: string | null): string {
-  // Trusted defaults stay unquoted so the remote shell expands `~`; the
+  // Trusted defaults stay unquoted so the remote shell expands `~`; a
   // user-supplied override is shell-quoted to prevent command injection.
-  const candidates: Array<{ value: string; probe: string }> = preferred
-    ? [{ value: preferred, probe: shellQuote(preferred) }]
+  const candidates: Array<{ value: string; invocation: string }> = preferred
+    ? [{ value: preferred, invocation: shellQuote(preferred) }]
     : [
-        { value: 'subminer', probe: 'subminer' },
-        { value: '~/.local/bin/subminer', probe: '~/.local/bin/subminer' },
+        { value: 'subminer', invocation: 'subminer' },
+        { value: '~/.local/bin/subminer', invocation: '~/.local/bin/subminer' },
       ];
   for (const candidate of candidates) {
-    const probe = runSsh(host, `command -v ${candidate.probe} >/dev/null 2>&1`);
+    const command = `${REMOTE_RUNTIME_PATH} ${candidate.invocation}`;
+    const probe = runSsh(host, `${command} --help >/dev/null 2>&1`);
     if (probe.status === 0) {
-      return candidate.value;
+      return command;
     }
   }
   throw new Error(