- Split loadCSV into parseCSVString (content) and loadCSVFromPath
(path); drop isCSV/looksLikeCsv heuristics
- Delete coerceSparkTables and markedTable label-header magic;
plain markdown tables now render as plain tables
- Add explicit markdown role=spark-table fence syntax that converts
pipe tables to CSV at scan time, with dice-header validation
- Map ESM-only github-slugger and csv-parse browser build to CJS in
jest config; add content-registry tests
