Initial roast planner webapp: fillable worksheet, live ledger, curve, URL prefill, .alog reference curve

- shared/ ports the worksheet's ledger math, time parsing, and reference tables
  (cultivars/processes/roast-levels/machine bands) as browser-safe ESM, imported
  by both the server and the browser so the arithmetic can't drift between them.
- server/prefill.js runs a zero-tool Pi Coding Agent SDK turn to extract page facts
  from a bean product URL, then derives worksheet field IDs deterministically from
  reference-data.js — the model never invents a first-crack anchor or a modifier.
- server/alog.js ports the Python alog_parser.py's format handling, including the
  tokenizer-based Python-dict-literal-to-JSON conversion the real files need.
- public/ is the worksheet reproduced as a live HTML form: worksheet.css is a
  verbatim copy of the paper worksheet's print CSS, print.js bakes values into
  the print layout so the same DOM renders both on screen and on paper.
- Ledger math verified against both of the paper worksheet's worked examples;
  alog parser verified against all 14 real logs in ref/roasts/.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

.gitignore

@@ -0,0 +1,4 @@
+node_modules/
+data/
+*.log
+.DS_Store