Document pre-compare transforms for tenzir-test

[mavam]

Summary

• Add pre-compare to the configuration options table in the test framework reference
• Add a dedicated Pre-compare transforms section with workflow explanation, examples, and use cases
• Add shell script example showing comment-based configuration
• Add cross-reference from the Baselines and artifacts section
• Add Handle non-deterministic output section in the write-tests guide

The pre-compare feature allows normalizing test output before comparison with baselines, which helps handle tests with non-deterministic output from hash-based aggregations, parallel operations, or filesystem enumeration.

Related PRs

• Implementation: Apply code review fixes for pre-compare feature test#10

Test plan

• Verify the reference documentation renders correctly
• Verify internal links work (pre-compare transforms anchor)
• Check that the guide section follows the existing style

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