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### Summary 1. It changes the fallback semantics of the locate phase. When no chunks are found, the system stays in locate. If the same claim has two consecutive locate rounds with neither evidence chunks nor newly routed document scope, web_search is admitted to the candidate tool set on the next locate round as an external fallback. 2. It makes locate_empty_streak claim-scoped instead of shared in the global context. This prevents one claim’s empty locate rounds from affecting sibling claims running in parallel. 3. On the config side, it only raises max_parallel_agents for high / ultra to 4, without changing max_agent_cycles. This increases parallel claim execution without deepening per-claim search.