fix: backfill model on gateway sessions after agent runs#1306
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Gateway sessions end up with model=NULL because the session row is created before AIAgent is constructed. After the agent responds, update_session() writes token counts but never fills in the model. Thread agent.model through _run_agent()'s return dict into update_session() → update_token_counts(). The SQL uses COALESCE(model, ?) so it only fills NULL rows — never overwrites a model already set at creation time (e.g. CLI sessions). If the agent falls back to a different provider, agent.model is updated in-place by _try_activate_fallback(), so the recorded value reflects whichever model actually produced the response. Fixes #987
Add regression coverage for backfilling NULL gateway session models in SQLite, preserving existing models, and forwarding the resolved agent model through SessionStore updates.
Use getattr() when returning model metadata from GatewayRunner._run_agent so fake agents and minimal stubs without a model attribute do not break unrelated gateway flows while preserving the session-model backfill behavior.
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Summary
NULLin SQLiteCOALESCE(model, ?)behavior so existing session models are never overwritten_run_agent()tolerates fake agents and test doubles that do not define amodelattributeContributor credit
Test plan
python -m pytest tests/test_hermes_state.py tests/gateway/test_session.py tests/gateway/test_reasoning_command.py tests/gateway/test_run_progress_topics.py -n0 -qpython -m pytest tests/ -n0 -qCloses #987