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Slate v2 Phase 9 Placeholder Matrix

docs/plans/2026-04-06-slate-v2-phase9-placeholder-matrix.md

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Slate v2 Phase 9 Placeholder Matrix

Supporting plan. For current queue and roadmap truth, see master-roadmap.md.

Goal

Widen the placeholder family in the replacement matrix with the legacy custom-placeholder surface.

Scope

  • add one legacy custom-placeholder row
  • sync the placeholder family docs if it lands cleanly

Constraints

  • do not turn this into a broader placeholder redesign
  • keep the row family-level and evidence-driven
  • verify through the cross-repo local runner on current port 3010

Progress

  • added one legacy custom-placeholder row to the replacement compatibility matrix
  • proved the row through the cross-repo local runner
  • synced the scoreboard and placeholder-family docs so the landed Phase 9 slice is visible in the roadmap stack
  • verification:
    • bash ./scripts/run-cross-repo-local.sh 3010 /examples/placeholder ../slate 3210 /examples/custom-placeholder "yarn build:slate-browser:playwright && yarn exec playwright test playwright/integration/examples/replacement-compatibility.test.ts --project=chromium --workers=1"