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## Why Clock provider failures can abort a turn while preparing time context or running clock tools. Allow turns to continue with an explicit indication that the current time is unavailable. ## What changed - Add `features.nonfatal_clock_read_errors`, disabled by default, to report clock failures to the model without failing the turn. - Emit a generic `failed to read current time` notice for context reads and tool errors, without exposing provider error details. Deduplicate context notices per turn and compaction window, and remove inherited notices from forked subagent context. - Omit unavailable environment dates and explicitly clear previously visible dates with `<current_date status="unavailable" />`. - Return external sleep clock failures to the model when the feature is enabled, preserving sleep item completion notifications. ## Testing Add coverage for continued inference after clock failures, notice deduplication across compaction, subagent notice filtering, environment date removal and recovery, and sleep failures during initial and polling reads. GitOrigin-RevId: a39c3723c06a6f786d8ad59d667e8b9f626c973e