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## Why Forked threads reported `startup`, causing startup hooks to run again even when their context was inherited from the parent. Resuming with supplied history also reported `startup` instead of `resume`. ## What changed - Add `fork` as a `SessionStart` source and expose it in the hook input schema. - Report `fork` for histories with a fork parent and `resume` for supplied histories without one. - Continue dispatching `SubagentStart` for spawned subagents with either fresh or forked context. ## Testing Add regression coverage for fork hook matching without duplicate startup context, resume hooks with supplied history, and `SubagentStart` context injection for fresh and forked subagents. GitOrigin-RevId: 5ac1ae4ab8adcbbbceb8cb0ffb9b32b6402c585b