test: locate the fastled CLI at runtime when run from a nextest archive

cache_upgrade_cli started the CLI from env!("CARGO_BIN_EXE_fastled"),
a path fixed when the test was compiled. The macOS lane cross-builds the
tests on Linux and runs them on a Mac, where that path does not exist
("No such file or directory"). Prefer nextest's runtime
NEXTEST_BIN_EXE_fastled and keep the compile-time path for plain
`cargo test`. The other 303 archived tests already passed on macOS.

The macOS lane also runs the viewer render and Safari smoke when a
Rust test fails, so one cycle reports every result.

Refs #242

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VfXV1EpgAvMZzXJfbGZPRG

Author: zackees

.github/workflows/macos-arm-live-test.yml

@@ -137,10 +137,14 @@ jobs:
           --archive-file "macos-arm-live-inputs/$TEST_ARCHIVE"
           --workspace-remap .
 
+      # The render and Safari checks still run when a Rust test fails, so one
+      # cycle reports every macOS result.
       - name: Enable Safari automation
+        if: ${{ !cancelled() }}
         run: sudo safaridriver --enable
 
       - name: Live viewer render and Safari smoke of the installed wheel
+        if: ${{ !cancelled() }}
         env:
           FASTLED_SAFARI_SMOKE: "1"
         run: |

crates/fastled-cli/tests/cache_upgrade_cli.rs

@@ -1,8 +1,16 @@
 use std::fs;
 use std::process::{Command, Output};
 
+/// The CLI under test. `CARGO_BIN_EXE_fastled` is fixed at compile time, so a
+/// test binary built on one machine and run from a nextest archive elsewhere
+/// (the macOS lane cross-builds on Linux) must use nextest's runtime path.
+fn fastled_exe() -> std::ffi::OsString {
+    std::env::var_os("NEXTEST_BIN_EXE_fastled")
+        .unwrap_or_else(|| env!("CARGO_BIN_EXE_fastled").into())
+}
+
 fn run_fastled(root: &std::path::Path) -> Output {
-    Command::new(env!("CARGO_BIN_EXE_fastled"))
+    Command::new(fastled_exe())
         .arg("--version")
         .env("FASTLED_HOME", root)
         .env("FASTLED_MANAGED_RUNTIME", "1")