fix(reset): clear mma_tier_usage and RAG state in _handle_reset_session

tests/conftest.py

@@ -663,8 +663,9 @@ def _reset_clean_baseline(request, live_gui) -> Generator[None, None, None]:
    if client.wait_for_server(timeout=5):
     client.reset_session()
     time.sleep(0.2)
-  except Exception:
-   pass
+  except Exception as e:
+   import sys
+   print(f"[CLEAN_BASELINE] reset failed: {type(e).__name__}: {e}", file=sys.stderr)
  yield
 
 

tests/test_reset_session_clears_mma_and_rag.py

@@ -0,0 +1,79 @@
+"""Regression test: _handle_reset_session must clear MMA + RAG state.
+
+Added in test_infrastructure_hardening_20260609 followup. Without these
+resets, prior test state pollutes the next session via:
+- mma_tier_usage: stale per-tier model/input/output values cause the
+  mma_state_update handler to merge with old data, leaving the new
+  push's active_tier effectively lost in the GUI render path.
+- rag_engine / rag_config: the chroma collection from a prior test
+  doesn't get rebuilt, causing RAG queries to return nothing.
+"""
+import time
+import pytest
+
+from src import api_hook_client
+
+
+@pytest.mark.clean_baseline
+def test_reset_session_clears_mma_tier_usage(live_gui) -> None:
+ """reset_session() must restore mma_tier_usage to the default (all empty)."""
+ client = api_hook_client.ApiHookClient()
+ assert client.wait_for_server(timeout=15)
+ # Pollute the mma_tier_usage via a mma_state_update push
+ client.push_event('mma_state_update', {
+  'status': 'running',
+  'active_tier': 'Tier 3 (Worker)',
+  'tier_usage': {'Tier 1': {'model': 'polluted'}},
+  'tickets': []
+ })
+ time.sleep(0.5)
+ # Trigger the reset
+ client.reset_session()
+ time.sleep(0.5)
+ # Verify the polluted entry is gone
+ state = client.get_gui_state()
+ mma = state.get('mma_state', {})
+ tier1 = mma.get('tier_usage', {}).get('Tier 1', {})
+ assert tier1.get('model') != 'polluted', (
+  f"reset_session() did not clear mma_tier_usage: {tier1!r}"
+ )
+
+
+@pytest.mark.clean_baseline
+def test_reset_session_clears_mma_status(live_gui) -> None:
+ """reset_session() must set mma_status back to 'idle'."""
+ client = api_hook_client.ApiHookClient()
+ assert client.wait_for_server(timeout=15)
+ client.push_event('mma_state_update', {
+  'status': 'running',
+  'active_tier': 'Tier 1 (Orchestrator)',
+  'tier_usage': {},
+  'tickets': []
+ })
+ time.sleep(0.5)
+ client.reset_session()
+ time.sleep(0.5)
+ state = client.get_gui_state()
+ assert state.get('mma_status') == 'idle', (
+  f"mma_status not reset: {state.get('mma_status')!r}"
+ )
+
+
+@pytest.mark.clean_baseline
+def test_reset_session_clears_active_tier(live_gui) -> None:
+ """reset_session() must set active_tier back to None."""
+ client = api_hook_client.ApiHookClient()
+ assert client.wait_for_server(timeout=15)
+ client.push_event('mma_state_update', {
+  'status': 'running',
+  'active_tier': 'Tier 2 (Tech Lead)',
+  'tier_usage': {},
+  'tickets': []
+ })
+ time.sleep(0.5)
+ client.reset_session()
+ time.sleep(0.5)
+ state = client.get_gui_state()
+ assert state.get('active_tier') is None, (
+  f"active_tier not reset: {state.get('active_tier')!r}"
+ )