⚙️ setup: add Clean Commit convention with AGENTS.md and Copilot instructions

[Copilot]

Implements Clean Commit workflow for standardized commit messages across the project using emoji-prefixed types.

Changes

• AGENTS.md - Root-level instructions for AI agents (Claude, Cursor, Windsurf)
• .github/instructions/copilot.instructions.md - GitHub Copilot commit message generation config

Format

<emoji> <type>: <description>
<emoji> <type> (<scope>): <description>

9 types: 📦 new, 🔧 update, 🗑️ remove, 🔒 security, ⚙️ setup, ☕ chore, 🧪 test, 📖 docs, 🚀 release

Reference: https://github.com/wgtechlabs/clean-commit

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[coderabbitai]

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