[brawer]

Adds docs/notes/2026-10-27-merging-ranks.md, a short design note on how the importance column (#713, #853) merges its three signals:

• why OSMViews, QRank and the category score are each turned into quantiles first;
• the reference populations, and why brand IDs without pageviews count as no brand;
• how a missing brand drops out of the weighted mean;
• why the category scores are hand-made (from MatchMask) and not derived from QRank medians;
• how the 0.4/0.3/0.3 weights were picked with pair tests;
• why the final score is a quantile again, what was left out, Swiss results, and how to evaluate changes.

TECHNICAL_DESIGN.md links to it from the conflate step.

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