Add Model Health report (size and formula hygiene)

[umang350]

Summary

New read-only Structure › Health report, worked out from the in-page model cache the Line Items report already uses (no Anaplan calls). Four tabs:

• Large Line Items / Large Modules: estimated cells (product of the item counts of the lists a line item applies to). Time, Versions and subsets have no count in the cache, so those rows are tagged Partial.
• Duplicate Formulas: identical after whitespace is collapsed, 25+ characters, with where they are used (calculate-once candidates).
• Complex Formulas: 400+ characters, 5+ IFs or 6+ bracket levels.

Only findings are sent back and cached, not every formula. Registered in PAGES, VIEWS, Summary's REPORTS, Download all, package.sh, and DL_STALE. CSV export per tab. CLAUDE.md and CHANGELOG updated.

Testing

• IA_health run on fixtures in Node (duplicates grouped across modules and spacing, cells, complexity, unknown list sizes).
• The view rendered in headless Chromium with a stubbed extension API and fake data: all four tabs draw, no page errors.
• node --check on every changed script; sh package.sh builds.
• Not tested on a live Anaplan model. The size estimate depends on list item counts and appliesTo names matching the cache's list names; thresholds are rules of thumb, not Anaplan limits.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Gp4Gxzr9KGd731nQ6UTixL

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