chore: move loose helper scripts into scripts/, fix doc refs

docs/scripts.md

@@ -18,17 +18,18 @@
 - `archive/get_coordinates.py` / `archive/get_calib_frame.py` — zone calibration
   (`calib_frame.jpg`, `zones.json`); `archive/capture_frame_native.py` — grab
   native frames (`live_frame_native.png`).
-- `extract_random_frames.py` — sample frames for labeling; `archive/check_*.py`
+- `scripts/extract_random_frames.py` — sample frames for labeling; `archive/check_*.py`
   (`check_20_23`, `check_20_aug`, `check_all_after`) — batch verification passes.
 - `archive/test_bytetrack.py`, `archive/test_track_crash.py` — tracker experiments/crash repro.
 
 ## DB / ops helpers
-`counter_dashboard.py` (dashboard), `check_jetson_db.py`,
+`counter_dashboard.py` (dashboard), `scripts/check_jetson_db.py`,
 `archive/backup.py`, `archive/dump_db.py`,
 `archive/migrate_jetson_db.py`, `archive/merge_batches_20_23.py`,
 `archive/merge_batches_28_35.py`, `archive/update_batches.py`,
 `archive/diagnose_truck_jetson.py`, `deploy_to_jetson.py`,
-`export_model.py` / `archive/export_v4.py` (TensorRT export).
+`export_model.py` / `archive/export_v4.py` (TensorRT export),
+`scripts/generate_guide_pdf.py` (operator guide PDF).
 
 ## Ignored at runtime (`.gitignore`)
 `.env`, `*.db`, state JSONs, `batch_history_folder/`, media (`*.mp4/*.jpg/*.png`),