code-style（代码风格）

Code Style: Mirror, Reuse, Symmetry

When writing new code in an existing codebase, follow these principles:

1. Mirror the surrounding code exactly: Match brace style, comment style, naming conventions, blank line spacing, code density, and level of detail by reading nearby code first.
2. Reuse existing patterns: Find the closest analogous feature and replicate its structure (method decomposition, control flow, annotations, guard clauses). Don't introduce new patterns when an existing one fits.
3. Reuse existing code: Before writing a new helper, check if an existing method can be reused or generalized. If a new helper is needed, model it after its closest sibling.
4. Maintain symmetry: If adding fooB() parallel to fooA(), ensure naming, parameter order, and structure are symmetric. Rename fooA() if needed.
5. Logical ordering: Place new methods, switch cases, and fields in the order that mirrors the existing grouping or business lifecycle, not just appended at the end.