feat(engine): add units, currency, datetime, variables, and functions modules

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Extracted and integrated unique feature modules from Epic 2-6 branches:

- units/: 200+ unit conversions across 14 categories, SI prefixes
  (nano-tera), CSS/screen units, binary vs decimal data, custom units
- currency/: fiat (180+ currencies, cached rates, offline fallback),
  crypto (63 coins, CoinGecko), symbol recognition, rate caching
- datetime/: date/time math, 150+ city timezone mappings (chrono-tz),
  business day calculations, unix timestamps, relative expressions
- variables/: line references (lineN, #N, prev/ans), section
  aggregators (sum/total/avg/min/max/count), subtotals, autocomplete
- functions/: trig, log, combinatorics, financial, rounding,
  list operations (min/max/gcd/lcm), video timecodes

585 tests passing across workspace.

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This commit is contained in:

C. Cassel

2026-03-17 09:01:13 -04:00

committed by C. Cassel

parent 6a8fecd03e

commit 68fa54615a

41 changed files with 11601 additions and 12 deletions

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