Revert "Add Kiro IDE support (.kiro/) (#548)"

This reverts commit ce828c1c3c.

.kiro/steering/python-patterns.md

@@ -1,40 +0,0 @@
----
-inclusion: fileMatch
-fileMatchPattern: "*.py"
-description: Python patterns extending common rules
----
-
-# Python Patterns
-
-> This file extends the common patterns rule with Python specific content.
-
-## Protocol (Duck Typing)
-
-```python
-from typing import Protocol
-
-class Repository(Protocol):
-    def find_by_id(self, id: str) -> dict | None: ...
-    def save(self, entity: dict) -> dict: ...
-```
-
-## Dataclasses as DTOs
-
-```python
-from dataclasses import dataclass
-
-@dataclass
-class CreateUserRequest:
-    name: str
-    email: str
-    age: int | None = None
-```
-
-## Context Managers & Generators
-
-- Use context managers (`with` statement) for resource management
-- Use generators for lazy evaluation and memory-efficient iteration
-
-## Reference
-
-See skill: `python-patterns` for comprehensive patterns including decorators, concurrency, and package organization.