feat: integrate Snowflake-direct indication lookup into CLI refresh (Task 1.2, 2.3)

Replace batch_lookup_indication_groups() with get_patient_indication_groups()
for indication chart processing. The new approach:

- Extracts unique PseudoNHSNoLinked values from HCD data
- Queries Snowflake directly using the cluster CTE
- Builds indication_df mapping UPID → Search_Term (matched) or Directory (fallback)
- Logs coverage statistics (diagnosis % vs fallback %)

This completes the integration of the new Snowflake-direct GP lookup approach.

IMPLEMENTATION_PLAN.md

@@ -52,12 +52,12 @@ python -m reflex compile
 - [ ] Verify: Function returns expected Search_Terms for test patients
 
 ### 1.2 Update Data Pipeline to Include Indications
-- [ ] Modify `cli/refresh_pathways.py` to call indication lookup during refresh:
+- [x] Modify `cli/refresh_pathways.py` to call indication lookup during refresh:
   - After fetching HCD data, extract unique PseudoNHSNoLinked values
   - Call `get_patient_indication_groups()` with patient list
   - Create `indication_df` mapping UPID → Indication_Group
   - For patients with no GP match: Indication_Group = fallback directorate
-- [ ] Log coverage: X% diagnosis-matched, Y% fallback
+- [x] Log coverage: X% diagnosis-matched, Y% fallback
 - [ ] Verify: indication_df has correct structure for pathway processing
 
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@@ -79,10 +79,10 @@ python -m reflex compile
 
 ### 2.3 Update Refresh Command for Dual Charts
 - [x] Add `--chart-type` argument: "all", "directory", "indication" (ALREADY DONE)
-- [ ] Update indication processing to use new `get_patient_indication_groups()`:
+- [x] Update indication processing to use new `get_patient_indication_groups()`:
   - Replace `batch_lookup_indication_groups()` with the new Snowflake-direct approach
   - Pass indication_df to `process_indication_pathway_for_date_filter()`
-- [ ] Process all 6 date filters for both chart types
+- [x] Process all 6 date filters for both chart types (existing loop already handles this)
 - [ ] Verify: Both chart types generate pathway data
 
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