feat(researcher): DCE-MRI BBB permeability bridge + drug-dose adjuster

feat(agents): retrieve_context corpus dispatch (reference vs clinical)

feat(agents): register run_fusion tool for multi-modal disease confidence

test(agents/orchestrator): pin caplog handler to INFO (hardens against pytest variance)

fix(agents/orchestrator): log dropped out-of-stage tool calls (was silent)

test(agents/routing): assert sites_csv key on NIfTI route (depth parity with EEG test)

test(agents/routing): regression tests for MRI/EEG/BBB routing heuristic

Add project files

fix(agents/live): skip on NotFoundError (model availability churns on OpenRouter free-tier)

fix(agents/live): also gate live test on BBB model artifact (avoids dotenv-loaded key path)

feat(api): POST /agent/run endpoint (orchestrator + RAG, stub-injectable)

fix(agents/tools): parameterize processed_dir + translate HTTPException → ValueError

feat(agents): orchestrator loop (function-calling + tool trace + max-steps gate)

feat(agents): Tool dataclass + registry + 4 tool wrappers (3 pipelines + RAG)