agent: add agent type to custom commands

Requirement:
Support 'agent' commit type across all custom commands to properly categorize
agent-related changes such as rules, commands, and automation updates.

Implementation:
- Added 'agent' type to make-branch type prefix list
- Added 'agent' type to make-commit type prefix list
- Added 'agent' type to make-pr type prefix list

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: 이영창(piknow)

.claude/commands/make-branch.md

@@ -22,6 +22,7 @@ i{issue-index}-{type}/{action-description_with_underscores}
 - `doc` - Documentation changes
 - `config` - Configuration updates
 - `refactor` - Code refactoring
+- `agent` - Add or update agent rules, commands, or automation
 - `format` - Code formatting changes (whitespace, indentation, semicolons, etc.)
 - `test` - Test additions or improvements
 - `perf` - Performance improvements

.claude/commands/make-commit.md

@@ -26,6 +26,7 @@ Analyze git changes (staged and unstaged) and create well-structured commits.
      * `doc`: Documentation changes
      * `config`: prettier, eslint, ci/cd, dependency installs/bumps, docker, vscode settings
      * `refactor`: Lint fixes, prettier fixes, output-unchanged code improvements
+     * `agent`: Add or update agent rules, commands, or automation
      * `format`: Code formatting changes (whitespace, indentation, semicolons, etc.)
      * `test`: Test additions or improvements, storybook, .test file additions
      * `perf`: Performance improvements

.claude/commands/make-pr.md

@@ -34,6 +34,7 @@ Generate titles based on branch analysis using these prefixes:
 - **doc**: Documentation changes
 - **config**: prettier, eslint, ci/cd, dependency installs/bumps, docker, vscode settings
 - **refactor**: Lint fixes, prettier fixes, output-unchanged code improvements
+- **agent**: Add or update agent rules, commands, or automation
 - **test**: Test additions or improvements, storybook, .test file additions
 - **perf**: Performance improvements