Fix chart labels, add version history table to README

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

branding/training_progress.svg

@@ -19,23 +19,23 @@
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 <text x="490.0" y="134.61508071113596" fill="#D35400" font-family="monospace" font-size="11" text-anchor="middle" font-weight="bold">3,175</text>
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