feat(datagen): add reserve grid positions and batch codes to lab config

- introduce reserve grid positions for QA witness pattern
- add batch codes to run entries in lab configuration
- update schedule with run start time and track interval
- enhance validation checks for run-batch mapping

docs/specs/03_csv_data_generation.md

@@ -17,7 +17,7 @@ Write `generate_data.py` (tabs for indentation, pure stdlib + numpy). Stream row
 out/csv/
 ├── batches.csv                      # 4 rows: deposition params
 ├── simtra/
-│   └── simtra_profile_<batch>.csv   # 4 files, 1000 rows each: angle, energy_eV, pt_flux, au_flux
+│   └── simtra_profile_<batch>.csv   # 4 files, 1000 rows each: angle_deg, energy_eV, pt_flux, au_flux
 ├── batch_<B>/wafer_<W>/
 │   ├── wafer_info.csv
 │   └── coupon_<C>/