Lets the deep-review LLM actively call read_file / grep / list_files to
verify cross-file impact instead of returning "请确认调用方" TODOs that
push the work back to humans. standard / triage paths unchanged; on any
agent-loop error the deep path automatically falls back to the previous
one-shot thinking call, so CI never breaks. Toggle via
AI_REVIEW_AGENT_ENABLED.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>