Add prompt templates

app/prompts/changelog.txt

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+Generate a changelog from the following git commit history. Group changes by type and format in markdown.
+
+## Conventional Commit Types to recognize:
+- **feat**: New features
+- **fix**: Bug fixes
+- **docs**: Documentation
+- **style**: Formatting
+- **refactor**: Code refactoring
+- **perf**: Performance improvements
+- **test**: Tests
+- **build**: Build system
+- **ci**: CI/CD
+- **chore**: Maintenance
+
+## Output Format:
+# Changelog
+
+## [Unreleased]
+
+## [Version] - YYYY-MM-DD
+
+### Features
+- feat(scope): description
+
+### Bug Fixes
+- fix(scope): description
+
+### Other Changes
+- chore(scope): description
+
+## Notes:
+- Use semantic version-like version headers
+- List changes in reverse chronological order
+- Use proper markdown formatting
+- Include commit types where clear
+- Omit trivial commits (merge commits, version bumps)