Slate v2 Phase 9 Richtext Decision

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

Goal

Make the richtext family less vague in the replacement envelope.

Scope

• add one legacy richtext row to the replacement compatibility matrix
• use that evidence to sharpen the family ledger
• keep the current v2 side honest by not inventing a fake richtext surface

Constraints

• no pretend current richtext parity
• no broad richtext implementation batch hidden inside a matrix slice
• verify through the cross-repo local runner on current port 3010

Progress

• added one legacy richtext row to the replacement compatibility matrix
• proved the row through the cross-repo local runner
• used that evidence to sharpen the family ledger:
  • richtext is now comparison-only
  • not vague not-yet-covered
• synced the scoreboard and top-level v2 docs so the landed Phase 9 slice is visible in the roadmap stack
• verification:
  • bash ./scripts/run-cross-repo-local.sh 3010 /examples/rich-inline ../slate 3210 /examples/richtext "yarn build:slate-browser:playwright && yarn exec playwright test playwright/integration/examples/replacement-compatibility.test.ts --project=chromium --workers=1"