Slate v2 Phase 9 Structural Comparison Families

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

Goal

Pull the broad structural/product families out of the vague “later” bucket and into explicit comparison-only status where the evidence is already cheap.

Scope

• add legacy-only comparison rows for:
  • tables
  • embeds
  • editable-voids
• sync the replacement family ledger from generic “intentionally later” wording to sharper family-by-family comparison-only wording where justified

Constraints

• no fake current v2 support claims
• no broad implementation batch for these families
• use the matrix to keep the families visible while preserving honest deferral

Progress

• added legacy-only comparison rows for:
  • tables
  • embeds
  • editable-voids
• proved the expanded matrix through the cross-repo local runner
• sharpened the family ledger so those families are now comparison-only instead of generic later-bucket hand-waving
• synced the scoreboard and top-level roadmap stack
• verification:
  • bash ./scripts/run-cross-repo-local.sh 3010 /examples/rich-inline ../slate 3210 /examples/tables "yarn build:slate-browser:playwright && yarn exec playwright test playwright/integration/examples/replacement-compatibility.test.ts --project=chromium --workers=1"