Task 105231835838

fees: return `block_policy` fee rate estimate when `mempool_policy` is not ready

2026-09-17 13:55:12 completed 09-2026-fee-estimator-not-ready-fallback 3db35b0b4b8441b5effeea1d17e66ac18a436b82

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[meta] record frozen commit

09-2026-fee-estimator-not-ready-fallback