refactor: replace standalone _id with id across protocol files, tests, and docs

Replace MongoDB-style _id field references with the platform-standard id
field name in:
- Mock kernels (studio, client tests)
- REST, runtime, and objectql test data
- QA testing schema and tests
- Documentation examples and SQL snippets

Compound identifiers (owner_id, account_id, tenant_id) are preserved.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Copilot

apps/studio/src/mocks/createKernel.ts

@@ -65,7 +65,7 @@ export async function createKernel(options: KernelOptions) {
                 if (method === 'create') {
                      const res = await ql.insert(params.object, params.data);
                      const record = { ...params.data, ...res };
-                     return { object: params.object, id: record.id || record._id, record };
+                     return { object: params.object, id: record.id, record };
                 }
                 if (method === 'get') {
                      // Delegate to protocol for proper expand/select support
@@ -74,7 +74,7 @@ export async function createKernel(options: KernelOptions) {
                      }
                      let all = await ql.find(params.object);
                      if (!all) all = [];
-                     const match = all.find((i: any) => i.id === params.id || i._id === params.id);
+                     const match = all.find((i: any) => i.id === params.id);
                      return match ? { object: params.object, id: params.id, record: match } : null;
                 }
                 if (method === 'update') {
@@ -85,7 +85,7 @@ export async function createKernel(options: KernelOptions) {
                          if (all && (all as any).value) all = (all as any).value;
                          if (!all) all = [];
 
-                         const existing = all.find((i: any) => i.id === params.id || i._id === params.id);
+                         const existing = all.find((i: any) => i.id === params.id);
 
                          if (!existing) {
                              console.warn(`[BrokerShim] Update failed: Record ${params.id} not found.`);
@@ -183,7 +183,7 @@ export async function createKernel(options: KernelOptions) {
                              : String(queryOptions.select).split(',').map((s: string) => s.trim());
 
                         all = all.map((item: any) => {
-                            const projected: any = { id: item.id, _id: item._id }; // Always include ID
+                            const projected: any = { id: item.id }; // Always include ID
                             selectFields.forEach((f: string) => {
                                 if (item[f] !== undefined) projected[f] = item[f];
                             });

content/docs/guides/standards.mdx

@@ -545,7 +545,7 @@ describe('Account Object', () => {
 - [ ] All objects use `ObjectSchema.create()`
 - [ ] Field names are `snake_case`
 - [ ] Config keys are `camelCase`
-- [ ] Lookups don't have `_id` suffix
+- [ ] Lookups don't have `_id` suffix (use `id`)
 - [ ] All validations have clear messages
 - [ ] Documentation is up to date
 - [ ] Tests pass

content/docs/protocol/objectql/index.mdx

@@ -147,7 +147,7 @@ const query: Query = {
 -- PostgreSQL (with JOIN)
 SELECT c.company_name, c.industry, u.name AS "owner.name"
 FROM customer c
-LEFT JOIN user u ON c.owner_id = u._id
+LEFT JOIN user u ON c.owner_id = u.id
 WHERE c.industry = 'tech' AND c.annual_revenue > 1000000
 ORDER BY c.created_at DESC
 LIMIT 10;

content/docs/protocol/objectql/query-syntax.mdx

@@ -407,7 +407,7 @@ SELECT
   o.amount, 
   a.company_name AS "account.company_name"
 FROM opportunity o
-LEFT JOIN account a ON o.account_id = a._id
+LEFT JOIN account a ON o.account_id = a.id
 ```
 
 ### Multiple Relationships
@@ -594,7 +594,7 @@ const query = {
     ['exists', {
       object: 'opportunity',
       filters: [
-        ['account_id', '=', '{{parent._id}}'],
+        ['account_id', '=', '{{parent.id}}'],
         ['stage', '=', 'Closed Won']
       ]
     }]
@@ -603,7 +603,7 @@ const query = {
 
 // SQL: WHERE EXISTS (
 //   SELECT 1 FROM opportunity 
-//   WHERE opportunity.account_id = account._id 
+//   WHERE opportunity.account_id = account.id 
 //   AND opportunity.stage = 'Closed Won'
 // )
 ```
@@ -617,7 +617,7 @@ const query = {
     ['not_exists', {
       object: 'opportunity',
       filters: [
-        ['account_id', '=', '{{parent._id}}']
+        ['account_id', '=', '{{parent.id}}']
       ]
     }]
   ]
@@ -778,17 +778,17 @@ const page2 = await ObjectQL.query({
 const result = await ObjectQL.query({
   object: 'customer',
   limit: 10,
-  sort: [{ field: '_id', order: 'asc' }]
+  sort: [{ field: 'id', order: 'asc' }]
 });
 
-// Next page (use last _id as cursor)
+// Next page (use last id as cursor)
 const nextResult = await ObjectQL.query({
   object: 'customer',
   filters: [
-    ['_id', '>', result[result.length - 1]._id]
+    ['id', '>', result[result.length - 1].id]
   ],
   limit: 10,
-  sort: [{ field: '_id', order: 'asc' }]
+  sort: [{ field: 'id', order: 'asc' }]
 });
 ```
 
@@ -808,7 +808,7 @@ const customer = await ObjectQL.findOne('customer', '123');
 // Equivalent to:
 await ObjectQL.query({
   object: 'customer',
-  filters: [['_id', '=', '123']],
+  filters: [['id', '=', '123']],
   limit: 1
 });
 ```

content/docs/protocol/objectql/schema.mdx

@@ -75,7 +75,7 @@ label: Project
 ```
 
 This 2-line definition creates:
-- Database table `project` with system fields (`_id`, `created_at`, `updated_at`)
+- Database table `project` with system fields (`id`, `created_at`, `updated_at`)
 - REST API: `GET/POST/PUT/DELETE /api/project`
 - Admin UI: List view + Form
 - TypeScript types

content/docs/protocol/objectql/types.mdx

@@ -533,7 +533,7 @@ account_id:
   deleteBehavior: set_null  # or restrict, cascade
 ```
 
-**Storage:** Stores `_id` of referenced record
+**Storage:** Stores `id` of referenced record
 
 **Query behavior:**
 ```typescript
@@ -617,7 +617,7 @@ parent:
 **Storage:**
 ```json
 {
-  "_id": "123",
+  "id": "123",
   "_type": "account"
 }
 ```

content/docs/protocol/objectui/layout-dsl.mdx

@@ -522,7 +522,7 @@ sections:
   - type: related_list
     label: Contacts
     object: contact
-    relationField: account_id  # contact.account_id → account._id
+    relationField: account_id  # contact.account_id → account.id
     columns:
       - name
       - email

content/docs/references/qa/testing.mdx

@@ -126,7 +126,7 @@ A single step in a test scenario, consisting of an action and optional assertion
 | **description** | `string` | optional | Human-readable description of what this step tests |
 | **action** | `Object` | ✅ | The action to execute in this step |
 | **assertions** | `Object[]` | optional | Assertions to validate after the action completes |
-| **capture** | `Record<string, string>` | optional | Map result fields to context variables: `{ "newId": "body._id" }` |
+| **capture** | `Record<string, string>` | optional | Map result fields to context variables: `{ "newId": "body.id" }` |
 
 
 ---

content/prompts/platform/automation.prompt.md

@@ -85,7 +85,7 @@ export const LeadQualifyFlow: FlowSchema = {
       label: 'Get Lead Details',
       config: {
         object: 'lead',
-        filter: [['_id', '=', '{leadId}']]
+        filter: [['id', '=', '{leadId}']]
       }
     },
     {

content/prompts/plugin/data-seed.prompt.md

@@ -46,7 +46,7 @@ export async function seedRoles() {
       await object.insert(role);
       console.log(`Created Role: ${role.name}`);
     } else {
-      await object.update(existing._id, role);
+      await object.update(existing.id, role);
       console.log(`Updated Role: ${role.name}`);
     }
   }
@@ -103,7 +103,7 @@ export const SplitNamesJob: JobSchema = {
     for (const c of contacts) {
        const [first, ...rest] = c.full_name.split(' ');
        await ctx.broker.call('contact.update', { 
-           id: c._id, 
+           id: c.id, 
            data: { first_name: first, last_name: rest.join(' ') } 
        });
     }