Vignette polish: prose tightening, formatting, structure (citations + km² + highways + towns + chunk hiding)#72

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71-tighten-citation-prose

May 7, 2026

Commits on May 7, 2026

Tighten vignette citation prose; drop one decorative cite
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Fix km² superscript + adopt gq highway styling in vignette maps
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Filter kootenay-lake towns to Rossland, Castlegar, Nelson, Cranbrook, Kaslo, Nakusp
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Phase 1: hide visualization+styling chunks via echo=FALSE
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Phase 2: lift cd recipes out of comment blocks into shown eval=FALSE chunks
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Prepend cd:: to all cd_*() function calls in both vignettes
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