[ravimodiya]

Summary

• Add fractional-second precision tests to the existing temporal engine test suite.
• Verify compareInstants ordering and equivalence for fractional timestamps.
• Verify utcToLocal formatting with fractional seconds.
• Test isDeadlineReached immediately before, exactly at, and immediately after the deadline.
• Verify utcToDatetimeLocalInput handles fractional timestamps correctly.

Context

The originally referenced time-monotonic files are not present on the current main branch, so these tests extend the existing tests/temporal-engine.test.ts suite using the available time utilities.

Testing

• npm.cmd test
• git diff --check

Typecheck and lint were also run locally.

Resolves #489

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