Migrate copilot-instructions.md to AGENTS.md for multi-agent support

.vscode/mcp.json

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+{
+	"servers": {
+		"svelte-mcp-server": {
+			"url": "https://mcp.svelte.dev/mcp",
+			"type": "http"
+		}
+	},
+	"inputs": []
+}

AGENTS.md

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+# AGENTS.md
+
+## Description
+
+This is a content-driven website with three types of content:
+
+1. Post: An article that dives deeper into a topic.
+2. Note: A brief observation or thought.
+3. Video: A YouTube video instead of a post.
+
+## Stack
+
+- SvelteKit v2 with `adapter-node`.
+- Deployment to Railway.com with their zero-configuration deployments.
+- Svelte v5.
+- TypeScript.
+- Zod schemas.
+- TailwindCSS v4 and `tailwind-merge`.
+- Mdsvex for authoring posts and notes.
+- Package `@maiertech/sveltekit-helpers` to import reusable components, Zod schemas and TypeScript
+  types.
+- PNPM as package manager.
+
+## Conventions
+
+- Use PascalCase for both Svelte component names and their file names (e.g., PostCard.svelte).
+- Always use Svelte v5, never v4.
+- Prefer TailwindCSS in combination with tailwind-merge for styling, but you can use plain CSS
+  inside Svelte's `<style>` tag for complex styles.
+- Use `$env/dynamic/private` runtime variables in SvelteKit.
+- Don't return or throw SvelteKit's `error` function. It knows what to do.
+- Comments always end with a period.
+
+## Written Content
+
+- Use American English.
+- Be concise and clear in your explanations.
+- Use active voice and present tense.
+- Write in a conversational but professional tone.
+
+## svelte-mcp-server
+
+You are able to use the Svelte MCP server, where you have access to comprehensive Svelte 5 and
+SvelteKit documentation. Here's how to use the available tools effectively:
+
+### 1. list-sections
+
+Use this FIRST to discover all available documentation sections. Returns a structured list with
+titles, use_cases, and paths. When asked about Svelte or SvelteKit topics, ALWAYS use this tool at
+the start of the chat to find relevant sections.
+
+### 2. get-documentation
+
+Retrieves full documentation content for specific sections. Accepts single or multiple sections.
+After calling the list-sections tool, you MUST analyze the returned documentation sections
+(especially the use_cases field) and then use the get-documentation tool to fetch ALL documentation
+sections that are relevant for the user's task.
+
+### 3. svelte-autofixer
+
+Analyzes Svelte code and returns issues and suggestions. You MUST use this tool whenever writing
+Svelte code before sending it to the user. Keep calling it until no issues or suggestions are
+returned.
+
+### 4. playground-link
+
+Generates a Svelte Playground link with the provided code. After completing the code, ask the user
+if they want a playground link. Only call this tool after user confirmation and NEVER if code was
+written to files in their project.