- triangle viz loads once: .tidal source embedded per-row in catalog_view.json
  (no per-file fetch / relative-path fragility); take audio resolved at build
  time so a player only renders when a proxy exists; data-load failure banner
- usability: full-width search, fixed colgroup widths, ellipsized sound-lists,
  tooltip'd empty states (corner-C/B gap, not a disagreement)
- tide.py serve: serves the tide-table dir load-once, prints the triangle URL
- #56: drop empty/sketch take-types from candidate links (Take63/64 noise)
- #59 pattern_ngrams.py + PatternRegistry: mini-notation phrases as 'things'
  (unique/repeated/shared), track clustering by sound-token n-gram Jaccard
  (df-filtered + min-shingle guard). 73 tracks -> 1325 phrases, 193 shared,
  33 repeated; surfaces the gMask/gMute boolean idioms + euclid figures
- tests: 43 green (new guards: no empty/sketch candidates, source embedded,
  audio paths resolve; full UT+IT for the pattern registry)