docs: refresh img/ summary charts; add img index; cite reproducible stats

- Regenerated the three README charts from data/synthetic_1.2.6 via
  scripts/univariate_analysis.py --img (replaces the Feb 2026 ad-hoc versions)
- img/README.md: documents img/ as the published-docs chart directory
  (stable README link targets), with provenance and the regeneration command
- README: skew/mean narrative updated to the reproducible script output
  (mean 5.44, median 5.48; Fisher skew -0.03) with pointer to
  univariate_summary.txt, keeping the historical ODS reference
This commit is contained in:
Nathan Schneider committed 2026-10-02 08:47:30 -06:00
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commit 7c2de2cefb
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