chore: add repository infrastructure for AGENTS.md compliance

Author: metyatech

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DavidAnson/markdownlint-cli2-action@v19
+        with:
+          globs: "**/*.md"

.markdownlint.json

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+{
+  "MD013": false,
+  "MD033": false,
+  "MD041": false
+}

.markdownlintignore

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+AGENTS.md

AGENTS.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - Initial release

CHANGELOG.md

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+@AGENTS.md

CLAUDE.md

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+# Contributing
+
+Thank you for your interest in contributing to `skill-user-proxy`.
+
+## Development setup
+
+```bash
+git clone https://github.com/metyatech/skill-user-proxy.git
+cd skill-user-proxy
+```
+
+## Submitting changes
+
+1. Fork the repository and create a feature branch.
+2. Add or update tests for any changed behavior.
+3. Open a pull request with a clear description of the change.
+
+## Scope
+
+This skill covers **reviewer proxy approval procedures**. Please keep PRs scoped to plan review and quality validation.

CONTRIBUTING.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported |
+| ------- | --------- |
+| 0.1.x   | Yes       |
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities by opening a [GitHub Security Advisory](https://github.com/metyatech/skill-user-proxy/security/advisories/new).
+
+Do not open a public issue for security vulnerabilities.
+
+We aim to respond within 5 business days and will coordinate a fix and disclosure timeline with you.

SECURITY.md

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+{
+  "source": "github:metyatech/agent-rules@HEAD",
+  "global": true,
+  "domains": []
+}