Add core skill files

SKILL.md

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+---
+name: artifact-template-sw-ads-tiktok
+description: "Create a presentation using the SW Ads TikTok投前报告 template and its retained reference file. Use when the user selects this template, names SW Ads TikTok投前报告, or explicitly invokes $artifact-template-sw-ads-tiktok. 使用SW Ads糖果店铺投前方案的版式、配色与页面结构，创建精简的TikTok广告投前调研和投放计划演示文稿。"
+---
+
+# SW Ads TikTok投前报告
+
+Create a presentation from this template. Keep the reference file unchanged.
+
+## Workflow
+
+1. Read `artifact-template.json` and resolve its paths relative to this skill directory.
+2. Load [@presentations](plugin://presentations@openai-primary-runtime) and invoke its reference/template workflow with the retained file.
+3. Treat the user's prompt and available sources as the content input. Do not invent facts merely to fill a template slot.
+4. Clone or import the reference instead of replacing its visual system with generic defaults.
+5. Render and verify the finished presentation, then return the final artifact.
+
+## Fidelity
+
+Preserve source slides, layouts, masters, typography, geometry, images, charts, tables, and recurring slide chrome.
+
+User instructions control requested content and explicit deviations. The retained reference controls layout and formatting where the user has not requested a change.

artifact-template.json

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+{
+  "schemaVersion": 1,
+  "kind": "presentation",
+  "reference": "assets/reference.pptx",
+  "preview": "assets/preview.png"
+}