fix ai_pipeline cleanup on interrupted runs

[GautamKumarOffical]

Fixes #324

Changes

• Added trap handlers for INT, TERM, and EXIT signals
• Track and kill child processes on cleanup
• Remove temporary files but preserve logs
• Added --test-cleanup option for testing
• Documented in ai_pipeline.sh header

Testing

• Generated .logd diagnostic artifact
• 05167bc92143f9ed1aab (password)

[lobster-trap]

Diagnostics received. Thank you.

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