Ed L 41f138d5c3 feat: replace JSON with human-readable markdown .improv format
New format is diffable plain text with categories, items, formulas,
data cells, and views all readable without tooling. Legacy JSON files
(detected by leading '{') still load correctly for backwards compat.

Format overview:
  # Model Name
  ## Category: Type
  - Food
  - Gas [Essentials]
  ## Data
  Month=Jan, Type=Food = 100
  ## View: Default (active)
  Type: row

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-24 10:46:57 -07:00
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