giles 99c5c44cc1 Step 14: source locations — pos-to-loc, error-loc, sx-parse-loc — 15 tests ...

Pure SX layer: pos-to-loc (offset→line/col), error-loc (parse result→loc),
format-parse-error (human-readable error with source context line).
OCaml platform: cst_to_ast_loc (CST spans→loc dicts), sx-parse-loc
primitive (parse with locations), source-loc accessor.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-11 08:03:45 +00:00

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