test(cli): the default Claude pin goes through the exec and character checks (#1572, row 78)

Two default-pin cases (no --claude): the only claude on PATH is mode 0644,
and claude in a PATH dir with a space. render exits 1 with stdout empty
for each. PATH holds only the test's dirs. Author Rocko, reviewer Filbert
(27560), candidate manifest 3016dbf1.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/cli/tests/host.test.mjs

@@ -611,3 +611,41 @@ test("bus-service.sh refuses a directory pin and keeps a symlink default unresol
   assert.equal(pinned(r.stdout), join(linkBin, "claude"));
   assert.ok(!r.stdout.includes(real), "the target never reaches the unit");
 });
+
+// Row 78 (#1572): the default from `command -v claude` takes the same checks
+// as --claude. PATH holds only the test's dirs, so a real claude elsewhere on
+// the host can't stand in for the one under test.
+test("bus-service.sh refuses a default claude without the execute bit, or in a PATH dir with a space", (t) => {
+  const dir = tmp(t);
+  const script = join(REPO, "scripts", "bus-service.sh");
+  const tools = join(dir, "tools");
+  mkdirSync(tools);
+  symlinkSync(process.execPath, join(tools, "node"));
+  for (const tool of ["dirname", "sed", "readlink"]) {
+    const at = ["/usr/bin", "/bin"].map((d) => join(d, tool)).find((p) => existsSync(p));
+    symlinkSync(at, join(tools, tool));
+  }
+  const bash = ["/usr/bin/bash", "/bin/bash"].find((p) => existsSync(p));
+  const run = (bin) => spawnSync(bash, [script, "render"], { encoding: "utf8", env: { PATH: `${bin}:${tools}`, HOME: dir } });
+  const stand = (bin, mode) => {
+    mkdirSync(bin);
+    writeFileSync(join(bin, "claude"), '#!/bin/sh\necho "9.9.9 (Claude Code)"\n');
+    chmodSync(join(bin, "claude"), mode);
+    return bin;
+  };
+
+  // The only claude on PATH has no execute bit: `command -v` still returns
+  // it, and the -x check refuses it.
+  let r = run(stand(join(dir, "noexec-bin"), 0o644));
+  assert.equal(r.status, 1);
+  assert.match(r.stderr, /not an executable file/);
+  assert.equal(r.stdout, "");
+
+  // claude in a PATH dir with a space: systemd would split the pin there.
+  const spaced = stand(join(dir, "spaced bin"), 0o755);
+  r = run(spaced);
+  assert.equal(r.status, 1);
+  assert.match(r.stderr, /cannot carry/);
+  assert.ok(r.stderr.includes(join(spaced, "claude")), r.stderr);
+  assert.equal(r.stdout, "");
+});