fix: carry institutional→formal rename through analysis rename maps

Nathan renamed the Design gradient 'institutional' → 'formal' (v1.4.0).
The analysis scripts carry historical rename maps that route old data
(elite/institutional) into the current bicorder.json gradient names, and
those maps still stopped at 'institutional' — so old readings would have
silently misaligned against the v1.4.0 structure.

- bicorder_classifier.py / export_model_for_js.py: add
  institutional_vs_vernacular → formal_vs_vernacular, keep elite→formal
- json_to_csv.py TERM_RENAMES: same two-step route
- convert_csv_to_json.py GRADIENT_MAPPINGS: elite_vs_vernacular now maps
  to 'formal'
- bicorder_classifier.py demo ratings: use the current dimension name
- analysis/README.md: example run name 1.3.0 → 1.4.0

analysis/README.md

@@ -18,11 +18,11 @@ Runs:
 
 ### Adding a new run (e.g. re-running on edited gradients)
 
-1. Make a new run directory keyed by bicorder version, e.g. `data/synthetic_1.3.0/`.
+1. Make a new run directory keyed by bicorder version, e.g. `data/synthetic_1.4.0/`.
 2. Point `bicorder_batch.py` at the shared input and the new output:
    ```bash
    python3 scripts/bicorder_batch.py data/protocols_edited.csv \
-       -o data/synthetic_1.3.0/readings.csv \
+       -o data/synthetic_1.4.0/readings.csv \
        -b bicorder.json \
        -m <model> -a "<analyst>" -s "<standpoint>"
    ```