docs(protocol): the actions.mdx outputSchema bullet says the cloud AI runtime validates the action result

The bullet no longer claims "enabling structured tool chaining", which no
reading measured. It says what the runtime does with ai.outputSchema: the
action's result is validated against it and withheld when it does not conform,
and a schema the runtime cannot enforce is refused before the action runs.

Co-authored-by: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FNKm1SmPpuJASnbjxWGtsJ

Author: claude

content/docs/protocol/objectui/actions.mdx

@@ -491,7 +491,7 @@ ai:
 
 - `category` — overrides the derived tool category (`data`, `action`, `flow`, `integration`, `vector_search`, `analytics`, `utility`).
 - `paramHints` — per-parameter hints (keyed by param name or `recordId`) that tighten the JSON Schema the model sees without changing UI metadata.
-- `outputSchema` — JSON Schema for the return value, enabling structured tool chaining.
+- `outputSchema` — JSON Schema for the return value. The cloud AI runtime validates the action's result against it and withholds a result that does not conform; a schema it cannot enforce is refused before the action runs.
 - `requiresConfirmation` — override the human-in-the-loop gate for AI invocations.
 
 ## Real-World Examples