docs(spec): regenerate reference docs for composite externalId type

`pnpm --filter @objectstack/spec gen:schema && gen:docs` after the
`SeedSchema.externalId` union change. These files are generated from the Zod
schema (Prime Directive #1) and the check:docs CI gate flagged them stale.
Only the externalId type row changes (`string` → `string | string[]`) across
seed, seed-loader, and manifest reference tables.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JqZsDkKaCkpQGpJdEMEWDF

Author: claude

content/docs/references/data/seed-loader.mdx

@@ -183,7 +183,7 @@ Seed loader request with datasets and configuration
 
 | Property | Type | Required | Description |
 | :--- | :--- | :--- | :--- |
-| **seeds** | `{ object: string; externalId: string; mode: Enum<'insert' \| 'update' \| 'upsert' \| 'replace' \| 'ignore'>; env: Enum<'prod' \| 'dev' \| 'test'>[]; … }[]` | ✅ | Seeds to load |
+| **seeds** | `{ object: string; externalId: string \| string[]; mode: Enum<'insert' \| 'update' \| 'upsert' \| 'replace' \| 'ignore'>; env: Enum<'prod' \| 'dev' \| 'test'>[]; … }[]` | ✅ | Seeds to load |
 | **config** | `{ dryRun: boolean; haltOnError: boolean; multiPass: boolean; defaultMode: Enum<'insert' \| 'update' \| 'upsert' \| 'replace' \| 'ignore'>; … }` | ✅ | Loader configuration |
 
 

content/docs/references/data/seed.mdx

@@ -32,7 +32,7 @@ const result = Seed.parse(data);
 | Property | Type | Required | Description |
 | :--- | :--- | :--- | :--- |
 | **object** | `string` | ✅ | Target Object Name |
-| **externalId** | `string` | ✅ | Field match for uniqueness check |
+| **externalId** | `string \| string[]` | ✅ | Field (or composite list of fields) matched for the uniqueness check |
 | **mode** | `Enum<'insert' \| 'update' \| 'upsert' \| 'replace' \| 'ignore'>` | ✅ | Conflict resolution strategy |
 | **env** | `Enum<'prod' \| 'dev' \| 'test'>[]` | ✅ | Applicable environments |
 | **records** | `Record<string, any>[]` | ✅ | Data records |

content/docs/references/kernel/manifest.mdx

@@ -61,7 +61,7 @@ const result = Manifest.parse(data);
 | **dependencies** | `Record<string, string>` | optional | Package dependencies |
 | **configuration** | `{ title?: string; properties: Record<string, { type: Enum<'string' \| 'number' \| 'boolean' \| 'array' \| 'object'>; default?: any; description?: string; required?: boolean; … }> }` | optional | Plugin configuration settings |
 | **contributes** | `{ kinds?: { id: string; globs: string[]; description?: string }[]; events?: string[]; menus?: Record<string, { id: string; label: string; command?: string }[]>; themes?: { id: string; label: string; path: string }[]; … }` | optional | Platform contributions |
-| **data** | `{ object: string; externalId?: string; mode?: Enum<'insert' \| 'update' \| 'upsert' \| 'replace' \| 'ignore'>; env?: Enum<'prod' \| 'dev' \| 'test'>[]; … }[]` | optional | Initial seed data (prefer top-level data field) |
+| **data** | `{ object: string; externalId?: string \| string[]; mode?: Enum<'insert' \| 'update' \| 'upsert' \| 'replace' \| 'ignore'>; env?: Enum<'prod' \| 'dev' \| 'test'>[]; … }[]` | optional | Initial seed data (prefer top-level data field) |
 | **capabilities** | `{ implements?: { protocol: object; conformance?: Enum<'full' \| 'partial' \| 'experimental' \| 'deprecated'>; implementedFeatures?: string[]; features?: { name: string; enabled?: boolean; description?: string; sinceVersion?: string; … }[]; … }[]; provides?: { id: string; name: string; description?: string; version: object; … }[]; requires?: { pluginId: string; version: string; optional?: boolean; reason?: string; … }[]; extensionPoints?: { id: string; name: string; description?: string; type: Enum<'action' \| 'hook' \| 'widget' \| 'provider' \| 'transformer' \| 'validator' \| 'decorator'>; … }[]; … }` | optional | Plugin capability declarations for interoperability |
 | **extensions** | `Record<string, any>` | optional | Extension points and contributions |
 | **navigationContributions** | `{ app: string; group?: string; priority?: integer; items: { id: string; label: string; icon?: string; order?: number; … } \| { id: string; label: string; icon?: string; order?: number; … } \| { id: string; label: string; icon?: string; order?: number; … } \| { id: string; label: string; icon?: string; order?: number; … } \| { id: string; label: string; icon?: string; order?: number; … } \| { id: string; label: string; icon?: string; order?: number; … } \| { id: string; label: string; icon?: string; order?: number; … } \| { type: 'separator'; id?: string; order?: number } \| { id: string; label: string; icon?: string; order?: number; … }[] }[]` | optional | Navigation items this package contributes into apps owned by other packages |