Slate v2 Markdown/Table Package Hard Cut

Goal

Remove raw Slate slate-markdown and slate-table package surfaces. Markdown syntax policy and table feature policy belong in Plate or app/example code, not in unopinionated Slate.

Decisions

• Raw Slate keeps substrate APIs: schema, transforms, selections, normalization, clipboard/input hooks, and layout primitives.
• Plate owns Markdown parse/serialize/input-rule packages.
• Plate owns table maps, commands, cell-selection UX, and GFM table behavior.
• Slate examples may keep local fixtures to prove generic substrate behavior.
• slate-layout must consume generic app-provided geometry for table-like content; it must not depend on a raw Slate table package.

Progress

• Confirm package surfaces exist.
• Delete packages/slate-markdown.
• Delete packages/slate-table.
• Remove TypeScript/workspace references.
• Rewrite docs and plan references.
• Run focused verification.

Verification

• bun typecheck:packages in .tmp/slate-v2: pass.
• bun typecheck:root in .tmp/slate-v2: pass.
• bun lint:fix in .tmp/slate-v2: pass, no fixes applied.
• bun test:bun in .tmp/slate-v2: pass, 1157 pass, 95 skip.
• pnpm lint:fix in plate-2: pass, no fixes applied.