Phase-2 infodesign of the tide_eda corpus EDA: a standalone, scroll-driven
data essay (corpus.html) on the Ship's Bridge dark instrument language.

Six curated stories, vanilla SVG (zero npm deps), measured-width responsive:
1. the slow climb — studio vs club tempo, dual median lines + track cloud +
   histogram + felt-vs-written 2x inset; studio<->club lens is first-class
2. 2024 breakout — vocab burst + gig cadence on a shared time axis, magenta
   reserved for the one earned 2024 accent
3. palette — 12 sample families as a proportion bar, fleet colors + glyphs
4. the accent — signature gMask/gMute idioms (f*16 in 62/73)
5. collab fingerprint — per-collab bpm range + distinctive samples (raph fast)
6. set-staples — recurrence, Cafe trilogy highlighted

- tide_eda: add stage_tempo_by_year (gig-date x track-tempo) for the club lens
- build_corpus.py + 'tide.py corpus': inline-bundle to one self-contained file
  for deploy to me.nech.pl/parvagues/viz (dist/ gitignored)
- IntersectionObserver reveal/lazy-draw, reduced-motion + mobile reflow,
  load-fail banner; lens auto-disables on single-lens sections (honest)
- 59 tests green