feat: add Kiro CLI integration

[kienbui1995]

What does this PR do?

Add Kiro CLI integration — converts all Agency agents into Kiro CLI skill
files (SKILL.md) and installs them to ~/.kiro/skills/.

Motivation

Kiro CLI (https://kiro.dev/cli/) supports custom skills via ~/.kiro/skills/<name>/SKILL.md.
This PR adds first-class support so users can install all Agency agents
with a single command: ./scripts/install.sh --tool kiro

Changes

• scripts/convert.sh — add convert_kiro() (SKILL.md per agent)
• scripts/install.sh — add detect_kiro(), install_kiro(), interactive UI entry
• integrations/kiro/README.md — tool-specific docs
• integrations/README.md — add Kiro CLI section
• README.md — add Kiro CLI to Supported Tools + Quick Start + details block
• .gitignore — exclude generated integrations/kiro/skills/

Testing

• ./scripts/convert.sh --tool kiro → 112 agents converted
• ./scripts/install.sh --tool kiro → 112 skills installed to ~/.kiro/skills/
• Generated SKILL.md format verified against existing Kiro skills
• shellcheck: 0 new warnings
• bash syntax check: OK on both scripts

Checklist

• Follows existing integration patterns (matches antigravity/gemini-cli style)
• Tested in real scenarios
• Proofread and formatted correctly

[msitarzewski]

Thanks for the clean integration — this follows our existing patterns perfectly and we're ready to merge it.

There are some merge conflicts from other PRs that just landed (mostly .gitignore and README updates). Could you rebase on main to resolve? Should be straightforward. Once that's done we'll merge right away!

[kienbui1995]

@msitarzewski I have just resolved it. Please check more