fix(ai) - optimize metadata CRUD tools (#21235)

Reduces output tokens for all 13 metadata tools by (~49%) based on
production sampling data.

GET tools (field + object metadata)

System fields are now returned as compact {id, name, type} instead of
the full ~20-key payload (opt-in includeFullSystemFields to get full
payload). System objects are similarly compacted to {id, nameSingular,
namePlural}.
Internal fields the agent never uses (searchVector, deletedAt, position,
updatedBy) are excluded entirely.
workspaceId and applicationId are hoisted into a response envelope
instead of being repeated on every record.
Null/default-false properties are stripped from custom field and object
payloads (e.g. options: null, settings: null, isUIReadOnly: false).

CUD tools (create/update/delete)

Create and update field tools now return {id, name, type, label} instead
of the full DTO.
Create and update object tools now return {id, nameSingular,
labelSingular} instead of the full DTO.
Delete tools return {id, success: true} instead of the full DTO of the
deleted entity.
Validation errors are grouped by message — e.g. 10 fields failing the
same check produce one line with all names instead of 10 identical
lines.

Learn schemas (all tools)

UUID pattern regex stripped from JSON schemas (keeps format: "uuid").
$schema and additionalProperties: false stripped from all generated
schemas.
All Zod .describe() annotations and tool descriptions shortened.
Skill & tool description updates:

All references to the removed list_object_metadata_items tool replaced
with get_object_metadata / get_field_metadata across skill instructions,
dashboard tools, view filter/sort tools, and MCP server instructions.

packages/twenty-server/src/engine/metadata-modules/webhook/tools/delete-webhook.tool.ts

@@ -4,7 +4,7 @@ import { type WebhookToolContext } from 'src/engine/metadata-modules/webhook/too
 import { type WebhookToolDependencies } from 'src/engine/metadata-modules/webhook/tools/types/webhook-tool-dependencies.type';
 
 const deleteWebhookSchema = z.object({
-  id: z.string().uuid().describe('The id of the webhook to delete'),
+  id: z.uuid().describe('The id of the webhook to delete'),
 });
 
 type DeleteWebhookParams = z.infer<typeof deleteWebhookSchema>;

packages/twenty-server/src/engine/metadata-modules/webhook/tools/update-webhook.tool.ts

@@ -6,7 +6,7 @@ import { type WebhookToolDependencies } from 'src/engine/metadata-modules/webhoo
 import { compileWebhookOperations } from 'src/engine/metadata-modules/webhook/tools/utils/compile-webhook-operations.util';
 
 const updateWebhookSchema = z.object({
-  id: z.string().uuid().describe('The id of the webhook to update'),
+  id: z.uuid().describe('The id of the webhook to update'),
   targetUrl: z
     .string()
     .url()