Docs: add 6 documentation files (Issue #4)

docs/ARCHITECTURE.md

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+# Architecture
+
+## Overview
+Placeholder for system overview and design goals.
+
+## Components
+Placeholder for major components and responsibilities.
+
+## Data Flow
+Placeholder for request lifecycle and data movement.
+
+## Dependencies
+Placeholder for internal and external dependencies.
+
+## Decision Records
+Placeholder for ADRs and rationale links.

docs/CONTRIBUTING.md

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+# Contributing
+
+## Overview
+Placeholder for contribution guidelines and process.
+
+## Development Setup
+Placeholder for local setup steps and tooling.
+
+## Coding Standards
+Placeholder for style, linting, and formatting rules.
+
+## Testing
+Placeholder for test commands and expectations.
+
+## Pull Requests
+Placeholder for PR template and review process.

docs/DEPLOYMENT.md

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+# Deployment
+
+## Overview
+Placeholder for deployment environments and targets.
+
+## Prerequisites
+Placeholder for required tools, credentials, and access.
+
+## Steps
+Placeholder for deployment steps by environment.
+
+## Rollback
+Placeholder for rollback procedures and checks.
+
+## Verification
+Placeholder for post-deploy checks and monitoring.

docs/MCP_INTEGRATION.md

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+# MCP Integration
+
+## Overview
+Placeholder for MCP integration overview and goals.
+
+## Architecture
+Placeholder for components, data flow, and boundaries.
+
+## Configuration
+Placeholder for required config keys and examples.
+
+## Usage
+Placeholder for setup steps and example commands.
+
+## Security
+Placeholder for authentication, authorization, and secrets handling.
+
+## Troubleshooting
+Placeholder for common issues and resolutions.

docs/PLUGIN_DEVELOPMENT.md

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+# Plugin Development
+
+## Overview
+Placeholder for plugin development workflow and expectations.
+
+## Project Structure
+Placeholder for recommended folder layout and entry points.
+
+## API Surface
+Placeholder for SDK usage and versioning guidance.
+
+## Testing
+Placeholder for test strategy and tooling.
+
+## Publishing
+Placeholder for release steps and registry requirements.
+
+## Examples
+Placeholder for minimal plugin example.

docs/TROUBLESHOOTING.md

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+# Troubleshooting
+
+## Overview
+Placeholder for common issues and support workflow.
+
+## Diagnostics
+Placeholder for logs, status checks, and commands.
+
+## Known Issues
+Placeholder for known issues and workarounds.
+
+## Escalation
+Placeholder for escalation criteria and contacts.