Fix ai_pipeline cleanup on interrupted runs (#324)

[sureshchouksey8]

Fixes #324.

Summary

Adds robust cleanup handling to ai_pipeline.sh so interrupted runs clean up temporary files and managed child processes while retaining useful logs for debugging.

Changes

• Added cleanup traps for INT, TERM, and normal EXIT.
• Track and terminate managed child processes, including simulated long-running pipeline steps and GPU monitoring.
• Register and remove a per-run temporary workspace under ${TMPDIR:-/tmp}.
• Preserve run logs under logs/ and final metrics under metrics/.
• Added --cleanup-test for direct cleanup validation without external services.
• Added --cleanup-signal-test plus tests/check-ai-pipeline-cleanup.sh to start the pipeline, send TERM, and verify the temp workspace and child process are cleaned up through the actual signal path.
• Documented cleanup behavior and retained artifacts in docs/OPERATIONS.md.

Testing

• bash -n ai_pipeline.sh
• bash -n tests/check-ai-pipeline-cleanup.sh
• ./ai_pipeline.sh --cleanup-test
• tests/check-ai-pipeline-cleanup.sh
• ./ai_pipeline.sh --dry-run
• git diff --check
• python3 build.py

Diagnostic artifacts for implementation head 242f133c are committed:

• diagnostic/build-242f133c.json
• diagnostic/build-242f133c-part001.logd through part005.logd
• Password: 7bbf4962f0bc972c4600

Reassemble with:

cat diagnostic/build-242f133c-part001.logd diagnostic/build-242f133c-part002.logd diagnostic/build-242f133c-part003.logd diagnostic/build-242f133c-part004.logd diagnostic/build-242f133c-part005.logd > diagnostic/build-242f133c.logd
encryptly unpack diagnostic/build-242f133c.logd <outdir> --password 7bbf4962f0bc972c4600

python3 build.py generated real diagnostics. The remaining build failures are unrelated local/toolchain failures on this machine: missing cargo/go/cmake/luac/ghc, unavailable Java runtime, and an existing frailbox macOS C compile issue. Frontend and v2-market-stream passed.

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated, if applicable
• Configuration or schema changes are documented, if applicable
• No generated build artifacts are committed, except the required diagnostic build log
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

---

• I would like to request that my diagnostic build log is removed before merging

[lobster-trap]

Diagnostics received. Thank you.

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