fix(scripts): add signal handlers to nemoclaw-start.sh

[dknos]

Summary

• Adds SIGTERM/SIGINT trap to nemoclaw-start.sh
• Forwards signals to child processes to prevent orphaned background jobs on container shutdown
• Wraps wait in a loop to handle signal interruption (wait returns early when a trap fires)

Test plan

• Send SIGTERM to the start script and verify child processes are terminated
• Run shellcheck on the modified script (passes in pre-commit)

Fixes #1427

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between c99e3e8 and 6d2d119.

📒 Files selected for processing (1)

• scripts/nemoclaw-start.sh

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