chore(context): refactor for consistency, optimize formatting, and simplify logic

- Cleaned up unnecessary comments in `__all__` definitions for better readability.
- Adjusted indentation and formatting across modules for improved clarity (e.g., long lines, logical grouping).
- Simplified conditional expressions and inline comments for context scoring and ranking.
- Replaced some hard-coded values with type-safe annotations (e.g., `ClassVar`).
- Removed unused imports and ensured consistent usage across test files.
- Updated `test_score_not_cached_on_context` to clarify caching behavior.
- Improved truncation strategy logic and marker handling.

backend/app/services/context/adapters/claude.py

@@ -5,7 +5,7 @@ Provides Claude-specific context formatting using XML tags
 which Claude models understand natively.
 """
 
-from typing import Any
+from typing import Any, ClassVar
 
 from ..types import BaseContext, ContextType
 from .base import ModelAdapter
@@ -25,7 +25,7 @@ class ClaudeAdapter(ModelAdapter):
     - Tool result wrapping with tool names
     """
 
-    MODEL_PATTERNS: list[str] = ["claude", "anthropic"]
+    MODEL_PATTERNS: ClassVar[list[str]] = ["claude", "anthropic"]
 
     def format(
         self,