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/rules/data-naming-units.md

@@ -60,6 +60,8 @@ canonical tokens (as they appear in CSV headers):
 | `_V` | volt | `discharge_voltage_V` |
 | `_W` | watt | `power_W` |
 | `_C` | degree Celsius | `temperature_C` |
+| `_deg` | degree (angle) | `angle_deg`, `pt_gun_tilt_deg` |
+| `_eV` | electronvolt | `energy_eV` |
 | `_pct` | percent (non-composition) | `rh_pct`, `cpu_util_pct` |
 | `_s` / `_mb` | seconds / megabytes (benchmark outputs) | `wall_s`, `peak_rss_mb` |
 

docs/rules/meta-cursor-rules.md

@@ -46,6 +46,10 @@ one-click SCM generator falls back to Cursor defaults and emits unprefixed junk
    project`, `clarify rules`).
 6. **Allowed special forms** - `Merge ...` commits are allowed as-is;
    `release(scope): vX.Y.Z` is allowed for releases.
+7. **Staged-diff grounding** - base the message ONLY on `git diff --cached`;
+   mention only staged paths; if the index is empty, output `No staged
+   changes`; never infer from unstaged diffs, untracked files, prior
+   commits, or chat context.
 
 ## 3. Keeping the mirror in sync