[maxffarrell]

Cards can already group content in sections, but consumers cannot request columns or carousels without bypassing the shared card model and building platform-specific payloads.

Adds optional Section(children, { layout }) hints for stack, columns, and carousel, including JSX, React conversion, and literal JSON. The default Section object stays unchanged. Each child section represents a column or carousel item; existing action IDs, values, and handlers are preserved.

• Slack renders eligible groups as native layouts or carousels. Complex items, field/card limits, and nested block budgets fall back to the existing vertical rendering.
• Teams renders columns with inline ActionSets so controls remain associated with their column. Carousels keep the existing vertical rendering compatible with Adaptive Card 1.5.
• Google Chat renders supported columns (up to two) and carousels, falling back when nested widget types cannot be represented.
• Other adapters retain their existing section rendering. New regression suites cover 15 additional adapter packages, including both Discord formats, Telegram, WhatsApp, email, and text-based adapters.

Both the SDK converters and runtime-free Slack/Teams helpers are covered. The Teams primitive converter also now retains initial select/radio values, matching the SDK converter.

Includes API/guide documentation and a minor changeset for chat, Slack, Teams, and Google Chat. This enables the portable rework of vercel-labs/json-render#457 without requiring its own Slack-specific renderer.

Validation:

• pnpm validate passed: knip, lint, workspace type checks, tests, and production builds
• 8,774 tests passed across 28 test packages
• pnpm konsistent passed
• Tested json-render's 31 chat tests against both its released adapters and these proposed adapter builds; additional composed payload checks passed for Slack, Teams, and Google Chat

Layout hints preserve each adapter's existing interaction support and platform limits; they do not add unsupported controls to every platform. No live provider API calls were made.

[vercel]

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