feat: generate implementation plan and design artifacts

specs/001-users-pukpuk-dev/data-model.md

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+# Data Model
+
+This document defines the data structures for the project, based on the entities identified in the feature specification.
+
+## User
+Represents an authenticated user of the admin panel.
+
+- **email**: `string` (required, unique)
+- **password**: `string` (required, hashed)
+- **role**: `enum` (required, values: `admin`, `editor`)
+
+## Blog Post
+Represents a single article.
+
+- **title**: `string` (required)
+- **slug**: `string` (required, unique)
+- **content**: `richText` (required)
+- **author**: `relationship` to `User` (required)
+- **category**: `relationship` to `Category` (required)
+- **publication_date**: `date` (required)
+- **meta_title**: `string` (required)
+- **meta_description**: `string` (required)
+
+## Portfolio Item
+Represents a single project.
+
+- **title**: `string` (required)
+- **slug**: `string` (required, unique)
+- **description**: `richText` (required)
+- **project_images**: `array` of `media` (required)
+- **completion_date**: `date` (required)
+- **meta_title**: `string` (required)
+- **meta_description**: `string` (required)
+
+## Category
+Represents a blog post category.
+
+- **name**: `string` (required)
+- **slug**: `string` (required, unique)