Per Tier 1 investigation
(docs/reports/INVESTIGATION_rag_phase4_final_verify_20260627.md),
two live_gui tests were leaking temp/relative paths into the shared
subprocess's ui_files_base_dir, which survived across @clean_baseline
tests and caused RAGEngine.index_file to silently no-op on a dead
base_dir.
Three fixes:
1. tests/test_rag_visual_sim.py: stop using tempfile.mkdtemp() (which
defaults to C:\Users\Ed\AppData\Local\Temp\tmpXXXX) and instead use
tempfile.mkdtemp(dir="tests/artifacts", ...). Also restore
files_base_dir and rag_enabled in finally so the next live_gui test
in the session doesn't inherit the dead path.
2. tests/test_visual_sim_mma_v2.py: stop changing files_base_dir to
'tests/artifacts/temp_workspace' and stop clicking btn_project_save
(which persisted the path to manual_slop.toml). The MMA lifecycle
does not depend on a specific files_base_dir.
3. src/app_controller.py _handle_reset_session: defensive fix that
resets ui_files_base_dir from the default project's base_dir. This
makes reset_session() robust to any future polluter (not just the
two known ones). Without this, a test that sets files_base_dir via
set_value leaves a dead path in the session-scoped subprocess even
after reset_session().
Verified: tests/test_rag_visual_sim.py passes 2/2 after the fix.
ed