Gestalt = production: marginalia-gestalt renders FIGURES, not duplicates

The gestalt review page rendered its own paint code (70 e_* + 6 j_*
functions in scripts/build_marginalia.py) that drifted from the
production figures in src/marginalia.py FIGURES. Reviewers saw a
different picture than readers; this is exactly how the user noticed
overlapping items on the gestalt that didn't ship on the example
pages.

Rebuild marginalia-gestalt.html as a thin view over production:

  scripts/build_marginalia.py shrinks from 1018 → 156 lines. Every
  gestalt card now pulls its paint function, intrinsic width, and
  intrinsic height directly from FIGURES[ATTACHMENTS[slug][0][1]];
  its score and commentary from SCORES[slug]. No bespoke paint code
  lives in the gestalt build script.

  Cards iterate every example in the manifest order (109 cards),
  skipping any slug without an attachment. The historical
  "operators-and-literals" gestalt-only slug (since split into
  "operators" + "literals" on main) drops out naturally.

  The journey-overview thumbnails section is removed — those j_*
  paint functions had no production equivalent. Per-section journey
  figures are reviewed on journey-figures-gestalt.html, which
  already uses production paint code.

Tests simplify: ALL_FIGURES = FIGURES (the gestalt has no separate
registry to audit). The 8 iterating geometry/grammar/size/emphasis
contracts run once over the 109 production figures instead of
duplicating work across two registries. 53 tests still pass.

Drift between "what readers see on /examples/<slug>" and "what
reviewers see on the gestalt" is now structurally impossible: there
is only one paint registry.

Author: claude