Create comprehensive agentic AI tools configuration for Vivaldi Mod Manager

[Copilot]

This PR addresses issue #[issue_number] by creating a complete set of configuration and support files to enable optimal collaboration with agentic AI tools like GitHub Copilot. The changes establish professional development workflows and provide comprehensive project context for AI-assisted development.

Changes Made

GitHub Workflows & Automation

• CI/CD Pipeline: Added Windows-specific .NET 8 build and test automation with artifact uploads
• Security Analysis: Integrated CodeQL scanning for C# and JavaScript with scheduled runs
• Release Automation: Created automated release workflow with proper artifact packaging
• Dependency Management: Configured Dependabot for NuGet packages and GitHub Actions updates

Development Environment Configuration

• Code Consistency: Added .editorconfig with .NET-specific formatting rules and C# style preferences
• File Handling: Configured .gitattributes for proper line endings and binary file detection
• Project Standards: Created Directory.Build.props with common properties, versioning, and analysis settings
• SDK Management: Added global.json to enforce .NET 8 minimum version across all environments

Community & Collaboration

• Issue Templates: Created structured YAML templates for bug reports and feature requests with Vivaldi-specific fields
• Pull Request Template: Added comprehensive PR template with Windows/Vivaldi testing requirements
• Code Ownership: Established CODEOWNERS file for review automation
• Documentation: Enhanced README with architecture overview, development setup, and project structure

Project Governance

• Contributing Guidelines: Added detailed CONTRIBUTING.md with development workflow and coding standards
• Security Policy: Created SECURITY.md with vulnerability reporting and user security guidance
• Code of Conduct: Implemented Contributor Covenant 2.1 standards
• Documentation Structure: Established docs/ directory for future technical documentation

AI Tool Optimization

These changes specifically enhance GitHub Copilot and other agentic AI tools by:

1. Rich Context: Comprehensive documentation provides AI tools with detailed project understanding
2. Consistent Patterns: Standardized code formatting and project structure improve AI code suggestions
3. Clear Architecture: Detailed SRS and README help AI understand the Windows service + WPF application architecture
4. Quality Gates: Automated testing and analysis ensure AI-suggested changes meet project standards

Validation

All configuration files have been validated for:

• ✅ YAML syntax correctness (workflows, templates, Dependabot)
• ✅ JSON syntax validation (global.json)
• ✅ XML syntax validation (Directory.Build.props, stylecop.ruleset)
• ✅ GitHub Actions best practices compliance
• ✅ .NET project conventions alignment

The configuration is specifically tailored for Vivaldi Mod Manager's unique requirements as a Windows-only .NET WPF application that manages browser modifications, ensuring all tooling and workflows are optimized for this specific use case.

Fixes #1

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[tomasforsman]

This is a well drafted set of foundational files for working on this project.

[Copilot]

Pull Request Overview

This PR creates a comprehensive development infrastructure for the Vivaldi Mod Manager project, establishing professional workflows, code standards, and AI tool optimization. The changes transform the repository from a basic project into a fully-configured development environment with automated CI/CD, security scanning, and extensive documentation.

• Implements complete GitHub Actions workflows for CI/CD, security analysis, and automated releases
• Establishes consistent code formatting and quality standards through .editorconfig, StyleCop rules, and MSBuild configuration
• Creates comprehensive project documentation including contributing guidelines, security policy, and community standards

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.editorconfig	Code formatting and style configuration for consistent development
.gitattributes	Git file handling configuration for proper line endings and binary detection
.github/workflows/*	CI/CD pipelines for building, testing, security scanning, and releases
.github/ISSUE_TEMPLATE/*	Structured templates for bug reports and feature requests
.github/pull_request_template.md	Standardized PR template with testing requirements
.github/CODEOWNERS	Code ownership definitions for automated review assignments
.github/dependabot.yml	Automated dependency update configuration
Directory.Build.props	Centralized MSBuild properties and project configuration
global.json	.NET SDK version management
stylecop.ruleset	Code analysis rules for maintaining quality standards
README.md	Comprehensive project documentation with architecture overview
CONTRIBUTING.md	Detailed contribution guidelines and development workflow
SECURITY.md	Security policy and vulnerability reporting procedures
CODE_OF_CONDUCT.md	Community standards and conduct guidelines
docs/README.md	Documentation directory structure and guidelines

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[Copilot]

The analyzer ID 'Microsoft.Analyzers.ManagedCodeAnalysis' refers to legacy FxCop analyzers that have been deprecated. For .NET 8 projects, use 'Microsoft.CodeAnalysis.NetAnalyzers' instead, which is the modern replacement and provides better integration with current tooling.

Suggested change

	<Rules AnalyzerId="Microsoft.Analyzers.ManagedCodeAnalysis" RuleNamespace="Microsoft.Rules.Managed">
	<Rules AnalyzerId="Microsoft.CodeAnalysis.NetAnalyzers" RuleNamespace="Microsoft.CodeAnalysis">