The legacy path was already narrowed to market-only compact execution, but the research stage remained the slowest leg and the profiler lacked persistent raw event artifacts for comparison. This change further compresses the compact prompts for Bull Researcher, Bear Researcher, and Research Manager, adds durable raw event dumps to the graph profiler, and keeps profiling evidence out of the runtime contract itself.
Constraint: No new dependencies and no runtime-contract pollution for profiling-only data
Rejected: Add synthetic timing fields back into the subprocess protocol | those timings are not real graph-stage boundaries and would mislead diagnosis
Rejected: Skip raw event dump persistence and rely on console output | makes multi-run comparison and regression tracking fragile
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep profiling as an external diagnostic surface; if stage timing ever enters contracts again, it must come from real graph boundaries
Tested: python -m pytest web_dashboard/backend/tests/test_executors.py web_dashboard/backend/tests/test_services_migration.py web_dashboard/backend/tests/test_api_smoke.py -q
Tested: python -m compileall tradingagents/agents/researchers/bull_researcher.py tradingagents/agents/researchers/bear_researcher.py tradingagents/agents/managers/research_manager.py orchestrator/profile_stage_chain.py
Tested: real provider profiling via orchestrator/profile_stage_chain.py with market-only compact settings; dump persisted to orchestrator/profile_runs/600519.SS_2026-04-10_20260413T184742Z.json
Not-tested: browser/manual consumption of the persisted profiling dump
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