feat(examples): add custom benchmark examples for BEAM#821

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egordm wants to merge 7 commits intorelease/v4.0.0from

chore/example-custom-baseline-benchmark

Commits on Mar 4, 2026

feat(examples): add custom benchmark examples with inline beginner comments
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fix: make AvailableAt.__str__() Windows-safe by removing colon
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feat(examples): add evaluate_forecasts.py for pre-existing predictions
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fix(examples): fix evaluate_forecasts.py imports and BacktestForecasterConfig
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refactor(examples): simplify evaluate_existing_forecasts and document data format
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feat(examples): add comparison scripts for benchmark results
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Commits on Mar 6, 2026

Merge remote-tracking branch 'origin/release/v4.0.0' into chore/example-custom-baseline-benchmark
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