Tom Boucher d2d2f7c088 fix(#2848): non-Latin titles no longer produce empty slugs (Cyrillic transliteration) (#2934) ...

* test(#2848): add failing-first regression for non-Latin slug transliteration

generateSlugInternal and slugify both strip non-ASCII chars with no
transliteration step, so an all-Cyrillic title reduces to an empty slug.
12-row matrix: Cyrillic regression (both impls), Latin negative control,
multi-letter mappings, soft/hard sign drops, Ukrainian extras, null
contract, CJK unaffected, mixed scripts, truncation parity, slugify's
distinct no-truncate contract.

* fix(#2848): transliterate Cyrillic titles to ASCII before slug strip

Both generateSlugInternal (src/core-utils.cts) and slugify
(src/gsd2-import.cts) stripped non-ASCII with no transliteration, so an
all-Cyrillic title reduced to an empty slug, producing unnamed phase
directories (01-) and empty milestone_slug init JSON.

Add a shared transliterateForSlug primitive (core-utils) covering Russian
+ the reported Ukrainian/Belarusian extras (і ї є ґ ў), with multi-letter
mappings (ж→zh ч→ch ш→sh щ→sch ю→yu я→ya) and dropped soft/hard signs
(ъ ь). It runs BEFORE the existing ASCII filter, so Latin-script text
hits zero map entries and is byte-for-byte unchanged (negative control).
slugify consumes the shared primitive, preserving its distinct single
hyphen-strip + no-truncation contract. CJK/unmapped scripts keep the
existing strip-to-ASCII behavior.

Also corrects two test assertions to match the chosen й→y mapping and the
б→b (not bie) transliteration.

* changeset(#2848): Fixed — non-Latin slug transliteration

* changeset(#2848): backfill PR number 2934

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Co-authored-by: sim <sim@local>

2026-07-31 10:56:11 -04:00

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