Preserve paginated history for spawned subagents - #33432
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## What changed - Inherit paginated history mode when spawning or forking a subagent from a paginated parent. - Load the parent's model context when forking and persist it as an inherited rollout prefix, while excluding that prefix from the child's projected turns, items, and metadata. - Record the boundary between inherited context and child history, and reject partially initialized paginated subagent rollouts on resume. - Resume paginated subagents from their stored model context instead of legacy rollout history. ## Testing Added coverage for fresh and forked paginated subagents, compacted-history forks, model-context resume, inherited-prefix projection, metadata isolation, and incomplete-prefix detection. GitOrigin-RevId: e57dc37c29aa4aaaf57b052b991be591d730e5ba
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Preserve paginated history for spawned subagents
What changed
Testing
Added coverage for fresh and forked paginated subagents, compacted-history forks, model-context resume, inherited-prefix projection, metadata isolation, and incomplete-prefix detection.