Tests: don't read the sample document aloud on every run (#75)

`hostile_params_never_panic` runs every command four times, Read Aloud
included, and on macOS that spawns `say` with the whole sample document:
four overlapping voices for minutes after `cargo test` returns. Skip it
with the other commands that reach outside the session; it ignores its
params, so junk payloads had nothing to exercise there.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/tests.rs

@@ -311,7 +311,9 @@ fn hostile_params_never_panic() {
         json!({"value": -1e308, "rows": 1e9}),
     ];
     for spec in reg.all() {
-        if spec.id.starts_with("file.") || spec.id == "insert.picture" || spec.id == "insert.textFromFile" {
+        // These reach outside the session: files, and Read Aloud starts the system speech
+        // synthesiser (`say` on macOS), which would read the sample document aloud on every run.
+        if spec.id.starts_with("file.") || spec.id == "insert.picture" || spec.id == "insert.textFromFile" || spec.id == "review.readAloud" {
             continue;
         }
         for j in &junk {