fix(ci): --no-fail-fast, deflake remaining sleeper copy, regression test

.github/workflows/rust-clippy.yml

@@ -98,7 +98,7 @@ jobs:
       - name: Rust workspace tests
         env:
           FRESHELL_SERVER_BIN: ${{ github.workspace }}/target/debug/freshell-server
-        run: cargo test --workspace --locked
+        run: cargo test --workspace --locked --no-fail-fast
 
       # Dedicated Tauri smoke with --nocapture so the CI log visibly shows
       # "using server binary:" (confirming the test exercised the real binary,

crates/freshell-ws/tests/pane_ledger_triggers.rs

@@ -1787,3 +1787,17 @@ async fn a_kill_whose_row_projection_fails_still_ends_the_terminal_and_converges
     registry.kill(&terminal_id);
     std::fs::remove_dir_all(&dir).ok();
 }
+
+/// Regression test for the shared `common::sleeper_cli_spec` uniqueness fix:
+/// two calls with the same name must not share a script path, or parallel
+/// tests race ETXTBSY ("Text file busy") when one writes while another execves.
+#[test]
+fn shared_sleeper_cli_spec_paths_are_unique_per_call() {
+    let first = sleeper_cli_spec("claude");
+    let second = sleeper_cli_spec("claude");
+    assert_ne!(
+        first.default_cmd, second.default_cmd,
+        "same-name specs from common::sleeper_cli_spec must not share a script path -- \
+         a shared path lets a later write race an earlier spawn's execve (ETXTBSY)"
+    );
+}

crates/freshell-ws/tests/restore_spawn_gate.rs

@@ -44,9 +44,16 @@ fn test_settings_value() -> serde_json::Value {
 /// A minimal always-present CLI spec (`/bin/sh` sleeper script) so non-shell
 /// creates genuinely spawn — the same recording-script convention as
 /// `session_identity_frames.rs` (these tests assert on wire frames, not argv).
+///
+/// Each call writes a **unique** script path (PID + atomic counter) so parallel
+/// tests in the same binary never collide with ETXTBSY ("Text file busy") when
+/// one test writes the script while another is executing a prior copy.
+static SLEEPER_COUNTER: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);
+
 fn sleeper_cli_spec(name: &str) -> freshell_platform::CliCommandSpec {
+    let seq = SLEEPER_COUNTER.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
     let script_path = std::env::temp_dir().join(format!(
-        "freshell-restore-gate-sleeper-{name}-{}.sh",
+        "freshell-restore-gate-sleeper-{name}-{}-{seq}.sh",
         std::process::id()
     ));
     std::fs::write(&script_path, "#!/bin/sh\nexec sleep 30\n").expect("write sleeper script");