fix(demo): guard read in pause for non-interactive execution in demo-offline.sh

[vaibhavsrv]

Problem

In ods/scripts/demo-offline.sh, helper function pause() pauses execution between interactive demo steps by calling read -r. When demo-offline.sh is executed non-interactively or in automated CI/documentation screenshot pipelines without an interactive TTY, read -r encounters an Immediate EOF or non-zero exit code under set -e, causing script failure.

Fix

Add [[ -t 0 ]] || return 0 TTY check in pause() to bypass interactive pauses in headless environments, and append || true to read -r in demo-offline.sh.

Verification

Ran bash -n ods/scripts/demo-offline.sh (passed cleanly). Verified headless pipe execution via ./scripts/demo-offline.sh < /dev/null. git diff --check passed cleanly.