Speed up BOLD challenge protocol tests#4405

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hkalodner wants to merge 10 commits into

hkalodner/challenge-test-improvements

Commits on Feb 20, 2026

Use head subscriptions in challenge_testing.WaitForTx

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Fix flaky MaxEmptyBatchDelay test with dynamic sleep

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Add changelog entry for WaitForTx subscription changes

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Fix race condition in event producer shutdown

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Speed up BOLD challenge protocol test from ~186s to ~24s

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Extract shared helpers for BOLD challenge test node creation and challenge tail

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Deduplicate L3 BOLD challenge test by reusing shared helpers

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Formatting fixes
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Add changelog entry for challenge test improvements

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Add backoff delay to edge tracker on failed actions

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