fix: mktemp wrapper creation and register custom shell via mapping

action.yml

@@ -157,7 +157,7 @@ runs:
         TEMP_DIR="${RUNNER_TEMP:-/tmp}"
         WRAPPER_DIR=$(mktemp -d "$TEMP_DIR/setup-ssh-client-XXXXXX")
         mkdir -p "$WRAPPER_DIR"
-        WRAPPER_PATH="$WRAPPER_DIR/ssh-remote-shell.sh"
+        WRAPPER_PATH="$(mktemp "$WRAPPER_DIR/ssh-remote-shell-XXXXXX.sh")"
         
         cat << 'WRAPPER_EOF' > "$WRAPPER_PATH"
         #!/bin/bash
@@ -180,6 +180,7 @@ runs:
         # Execute script on remote server
         # Use BatchMode to prevent interactive prompts
         # ConnectTimeout to fail fast if connection issues
+        echo "Executing script on remote server '${{ inputs.ssh-host }}' via SSH..."
         ssh -o BatchMode=yes \
             -o ConnectTimeout=10 \
             github-action-host \
@@ -207,8 +208,9 @@ runs:
       shell: bash
       run: |
         SHELL_WRAPPER_PATH="${{ steps.setup-shell-wrapper.outputs.shell-wrapper-path }}"
-        # Register custom shell for this job by setting a custom shell mapping
-        # in $GITHUB_ENV. This maps the shell name to the path. The runner will
-        # use the provided script path when 'shell: ssh-remote' is used in steps.
+        # Register custom shell for this job by mapping the shell name to the
+        # wrapper path. This is the recommended way to expose a custom shell
+        # for `shell: ssh-remote` in subsequent steps. We do this conditionally
+        # so `use-shell-wrapper` can be used to opt out.
         echo "ssh-remote=$SHELL_WRAPPER_PATH {0}" >> "$GITHUB_ENV"
         echo "✅ Custom shell 'ssh-remote' registered for this job"