feat(okf): scaffold ourdigital-okf skill skeleton + mini fixture bundle

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

custom-skills/97-ourdigital-okf/code/scripts/tests/fixtures/mini_bundle/datasets/sales.md

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+---
+type: BigQuery Dataset
+title: Sales
+description: All sales-related tables for the retail business.
+resource: https://console.cloud.google.com/bigquery?p=acme&d=sales
+tags: [sales]
+timestamp: 2026-05-28T00:00:00Z
+---
+
+The sales dataset contains [orders](/tables/orders.md) and [customers](/tables/customers.md).

custom-skills/97-ourdigital-okf/code/scripts/tests/fixtures/mini_bundle/index.md

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+# Datasets
+
+* [Sales](datasets/sales.md) - All sales-related tables.
+
+# Tables
+
+* [Orders](tables/orders.md) - One row per completed order.
+* [Customers](tables/customers.md) - One row per customer.

custom-skills/97-ourdigital-okf/code/scripts/tests/fixtures/mini_bundle/tables/customers.md

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+---
+type: BigQuery Table
+title: Customers
+description: One row per customer.
+resource: https://console.cloud.google.com/bigquery?p=acme&d=sales&t=customers
+tags: [sales, customers]
+timestamp: 2026-05-28T00:00:00Z
+---
+
+# Schema
+
+| Column        | Type   | Description           |
+|---------------|--------|-----------------------|
+| `customer_id` | STRING | Unique customer id.   |
+
+Referenced by [orders](/tables/orders.md).

custom-skills/97-ourdigital-okf/code/scripts/tests/fixtures/mini_bundle/tables/orders.md

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+---
+type: BigQuery Table
+title: Orders
+description: One row per completed customer order.
+resource: https://console.cloud.google.com/bigquery?p=acme&d=sales&t=orders
+tags: [sales, orders]
+timestamp: 2026-05-28T00:00:00Z
+---
+
+# Schema
+
+| Column        | Type    | Description                              |
+|---------------|---------|------------------------------------------|
+| `order_id`    | STRING  | Unique order identifier.                 |
+| `customer_id` | STRING  | FK to [customers](/tables/customers.md). |
+
+Part of the [sales dataset](/datasets/sales.md).