fix(n8n): drop Add fields the v3 API does not accept, correct docs

The Add operation exposed app_id, includes, and excludes in Additional
Fields and forwarded them to POST /v3/memories/add/. None of the three
are declared on that endpoint's schema (they belong to MemoryInput, used
by POST /v1/memories/), so they were silently dropped by the server.

app_id was worse than a no-op: the entity-id guard accepted it as
satisfying "at least one entity id", so filling only App ID passed local
validation and then sent a v3 request carrying no scope v3 recognises.
The guard now requires User ID, Agent ID, or Run ID.

Docs corrections alongside it:
- Add: document Custom Instructions and Custom Categories, which the
  node has always supported but the docs never mentioned
- Get Many: document Return All, which the docs omitted entirely
- README: Infer and Wait for Completion are independent controls; the
  README claimed infer=false returns synchronously, contradicting the
  node's own field description and its actual behaviour

integrations/n8n-nodes-mem0/nodes/Mem0/Mem0.node.ts

@@ -163,12 +163,6 @@ export class Mem0 implements INodeType {
 						type: 'string',
 						default: '',
 					},
-					{
-						displayName: 'App ID',
-						name: 'app_id',
-						type: 'string',
-						default: '',
-					},
 					{
 						displayName: 'Custom Categories',
 						name: 'custom_categories',
@@ -186,20 +180,6 @@ export class Mem0 implements INodeType {
 						description:
 							'Optional instructions that steer what the extractor keeps or ignores',
 					},
-					{
-						displayName: 'Excludes',
-						name: 'excludes',
-						type: 'string',
-						default: '',
-						description: 'Optional: skip memories matching this description',
-					},
-					{
-						displayName: 'Includes',
-						name: 'includes',
-						type: 'string',
-						default: '',
-						description: 'Optional: only extract memories matching this description',
-					},
 					{
 						displayName: 'Infer',
 						name: 'infer',
@@ -366,7 +346,6 @@ export class Mem0 implements INodeType {
 					const userId = this.getNodeParameter('userId', i, '') as string;
 					if (userId) body.user_id = userId;
 					if (addFields.agent_id) body.agent_id = addFields.agent_id;
-					if (addFields.app_id) body.app_id = addFields.app_id;
 					if (addFields.run_id) body.run_id = addFields.run_id;
 					if (addFields.metadata) {
 						try {
@@ -400,14 +379,11 @@ export class Mem0 implements INodeType {
 						}
 					}
 
-					if (addFields.includes) body.includes = addFields.includes;
-					if (addFields.excludes) body.excludes = addFields.excludes;
-
 					// API requires at least one entity id — fail clearly instead of a raw 4xx.
-					if (!body.user_id && !body.agent_id && !body.run_id && !body.app_id) {
+					if (!body.user_id && !body.agent_id && !body.run_id) {
 						throw new NodeOperationError(
 							this.getNode(),
-							'Add requires at least one of User ID, Agent ID, Run ID, or App ID',
+							'Add requires at least one of User ID, Agent ID, or Run ID',
 							{ itemIndex: i },
 						);
 					}