Reorganize directory, add manual dataset and sync tooling

- Move all scripts to scripts/, web assets to web/, analysis results
  into self-contained data/readings/<type>_<YYYYMMDD>/ directories
- Add data/readings/manual_20260320/ with 32 JSON readings from
  git.medlab.host/ntnsndr/protocol-bicorder-data
- Add scripts/json_to_csv.py to convert bicorder JSON files to CSV
- Add scripts/sync_readings.sh for one-command sync + re-analysis of
  any dataset backed by a .sync_source config file
- Add scripts/classify_readings.py to apply the LDA classifier to all
  readings and save per-reading cluster assignments
- Add --min-coverage flag to multivariate_analysis.py for sparse/shortform
  datasets; also applies in lda_visualization.py
- Fix lda_visualization.py NaN handling and 0-d array annotation bug
- Update README.md and WORKFLOW.md to document datasets, sync workflow,
  shortform handling, and new scripts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

analysis/bicorder_model.json

@@ -1,7 +1,7 @@
 {
   "version": "1.0",
   "bicorder_version": "1.2.6",
-  "generated": "2026-03-20T15:08:23.160614",
+  "generated": "2026-03-20T17:04:13.746203",
   "dimensions": [
     "Design_explicit_vs_implicit",
     "Design_precise_vs_interpretive",