feat: Add Kiro IDE and CLI support for deploy-on-aws plugin

[inariku]

Summary

Add support for Kiro (IDE and CLI) as a supported agent for the deploy-on-aws plugin.

Motivation

Kiro IDE (>=0.9) and Kiro CLI (>=1.24.0) support Agent Skills and MCP, which are the same standards this repository already uses. Adding Kiro support expands the reach of the plugin to Kiro users with minimal changes.

Proposed Changes

• Add .kiro/mcp.json mirroring the existing .mcp.json MCP server configuration
• Add .kiro/steering/deploy.md for auto-activation of the deploy skill
• Symlink .kiro/skills → existing skills/ directory (no duplication)
• Update README with Kiro IDE and CLI installation instructions
• Add Kiro to the Requirements section

Reference Implementation

A working implementation is available at: https://github.com/inariku/agent-plugins/tree/feat/kiro-support

Files Changed

File	Description
plugins/deploy-on-aws/.kiro/mcp.json	Kiro MCP server configuration
plugins/deploy-on-aws/.kiro/steering/deploy.md	Auto-activation steering
plugins/deploy-on-aws/.kiro/skills	Symlink to existing skills directory
README.md	Installation instructions and requirements