Improve CodeCoverage above 80% for timpani-o and timpani-n

[LGSI-KarumuriHari]

📝 Task Description

The project has migrated from the old coverage engine to the new LLVM-based engine in cargo-tarpaulin 0.32.7. This transition has revealed that actual code coverage is lower than previously reported:

Coverage Comparison:

• Old Engine (deprecated): ~85% coverage for both modules
• New LLVM Engine (current): ~72% coverage for both modules
• Target: ≥80% coverage per module

This task focuses on:

1. Adapting to the LLVM engine's more accurate coverage measurement
2. Improving test coverage for timpani-o (Rust orchestrator)
3. Improving test coverage for timpani-n (Rust node executor)

Current Status (LLVM Engine):

• timpani-o: ~72% coverage (needs +8%)
• timpani-n: ~72% coverage (needs +8%)

Testing and CI Integration Check

Ensure GitHub Actions pipeline runs:

./scripts/test_coverage.sh
# Should report ≥80% for both modules

📊 Acceptance Criteria

• timpani-o achieves ≥80% code coverage (LLVM engine)
• timpani-n achieves ≥80% code coverage (LLVM engine)
• All new tests pass locally and in CI
• HTML coverage reports document improved coverage
• Two separate PRs submitted and merged
• CI pipeline consistently reports ≥80% coverage

[LGSI-KarumuriHari]

@basheerFZ please assign this task to me for timpani-n , and @jayakrishnan04b for timpani-o ,Thanks