Seed script extends the fixture matrix with a shared "Content Fixtures"
pond (owned by fixture-user): an "Every Element" page covering every
editor schema node and mark (#24), and a "Fixture Image" page with one
real, servable uploaded image. "Every Element" loads a checked-in Yjs
snapshot (prisma/fixtures/content-page.yjs) generated from a
human-readable Markdown source (content-page.md) via a deterministic
regeneration script (pinned Y.Doc clientID; refuses to write a
snapshot that isn't a fixed point of the Markdown round-trip).
New apps/web/e2e/content.spec.ts consolidates the M2 content
regression pack: page lifecycle, editor basics, image paste, trash,
and — the pack's actual regression pin — a byte-for-byte comparison of
the fixture page's exported Markdown against the checked-in fixture.
Verified this catches regressions: temporarily mutated
docToMarkdown's heading serializer, rebuilt, re-seeded, confirmed the
comparison failed, then reverted.
This pack now runs in CI (a second step in the existing auth-e2e job,
reusing its already-built-and-seeded stack) alongside the existing
local-only feature packs.
Closes#32
