[`feat`] Add generic NanoEvaluator abstractions with NanoBEIR backward compatibility#3673

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hotchpotch wants to merge 21 commits intohuggingface:mainfrom

hotchpotch:nano-eval

Commits on Feb 24, 2026

Add generic NanoEvaluator abstractions with NanoBEIR compatibility
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docs: add local AGENTS guidance for NanoEvaluator PR workflow
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Add NanoEvaluator example scripts across dense/sparse/cross encoders
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Restore NanoBEIR docs and move generic behavior docs to NanoEvaluator classes
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Enhance Nano evaluator examples with per-dataset metric breakdown
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Refine metric-key comments and fix cross Nano config serialization
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Add NanoBEIR primary-metric unit tests and document sparse init invariant
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Add CSV output unit test for NanoBEIREvaluator
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Use neutral example dataset IDs in Nano evaluator unit tests
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