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

.github/instructions/copilot.instructions.md

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+---
+applyTo: "**"
+---
+
+# Clean Commit Workflow
+
+This repository follows the **Clean Commit** workflow for all commit messages.
+
+Reference: https://github.com/wgtechlabs/clean-commit
+
+## Commit Message Format
+
+```text
+<emoji> <type>: <description>
+<emoji> <type> (<scope>): <description>
+```
+
+## The 9 Types
+
+| Emoji | Type | What it covers |
+|:-----:|------|----------------|
+| 📦 | `new` | Adding new features, files, or capabilities |
+| 🔧 | `update` | Changing existing code, refactoring, improvements |
+| 🗑️ | `remove` | Removing code, files, features, or dependencies |
+| 🔒 | `security` | Security fixes, patches, vulnerability resolutions |
+| ⚙️ | `setup` | Project configs, CI/CD, tooling, build systems |
+| ☕ | `chore` | Maintenance tasks, dependency updates, housekeeping |
+| 🧪 | `test` | Adding, updating, or fixing tests |
+| 📖 | `docs` | Documentation changes and updates |
+| 🚀 | `release` | Version releases and release preparation |
+
+## Rules
+
+- Use lowercase for type
+- Use present tense ("add" not "added")
+- No period at the end
+- Keep description under 72 characters
+
+## Examples
+
+- `📦 new: user authentication system`
+- `🔧 update (api): improve error handling`
+- `🗑️ remove (deps): unused lodash dependency`
+- `🔒 security: patch XSS vulnerability`
+- `⚙️ setup: add eslint configuration`
+- `☕ chore: update npm dependencies`
+- `🧪 test: add unit tests for auth service`
+- `📖 docs: update installation instructions`
+- `🚀 release: version 1.0.0`

AGENTS.md

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+# Clean Commit Workflow
+
+When generating commit messages for this repository, follow the **Clean Commit** workflow.
+
+Reference: https://github.com/wgtechlabs/clean-commit
+
+## Format
+
+```text
+<emoji> <type>: <description>
+<emoji> <type> (<scope>): <description>
+```
+
+## The 9 Types
+
+| Emoji | Type | What it covers |
+|:-----:|------|----------------|
+| 📦 | `new` | Adding new features, files, or capabilities |
+| 🔧 | `update` | Changing existing code, refactoring, improvements |
+| 🗑️ | `remove` | Removing code, files, features, or dependencies |
+| 🔒 | `security` | Security fixes, patches, vulnerability resolutions |
+| ⚙️ | `setup` | Project configs, CI/CD, tooling, build systems |
+| ☕ | `chore` | Maintenance tasks, dependency updates, housekeeping |
+| 🧪 | `test` | Adding, updating, or fixing tests |
+| 📖 | `docs` | Documentation changes and updates |
+| 🚀 | `release` | Version releases and release preparation |
+
+## Rules
+
+- Use lowercase for type
+- Use present tense ("add" not "added")
+- No period at the end
+- Keep description under 72 characters
+
+## Examples
+
+- `📦 new: user authentication system`
+- `🔧 update (api): improve error handling`
+- `🗑️ remove (deps): unused lodash dependency`
+- `🔒 security: patch XSS vulnerability`
+- `⚙️ setup: add eslint configuration`
+- `☕ chore: update npm dependencies`
+- `🧪 test: add unit tests for auth service`
+- `📖 docs: update installation instructions`
+- `🚀 release: version 1.0.0`