trim patterns.md - remove duplication

- remove filterable decorator (covered in mcp.md)
- remove lowercase aesthetic (implicit in notes style)

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

Co-Authored-By: Claude Opus 4.5 <[e-mail]>

languages/python/language/patterns.md

···
 # callers can catch AppError for all, or specific types
 ```
 
-## decorators that modify signatures
-
-add parameters dynamically:
-
-```python
-import inspect
-from functools import wraps
-
-def filterable(fn):
-    """add _filter parameter for jmespath filtering."""
-    @wraps(fn)
-    async def wrapper(*args, _filter: str | None = None, **kwargs):
-        result = await fn(*args, **kwargs)
-        if _filter:
-            import jmespath
-            return jmespath.search(_filter, result)
-        return result
-
-    # modify signature to include new param
-    sig = inspect.signature(fn)
-    params = list(sig.parameters.values())
-    params.append(inspect.Parameter(
-        "_filter",
-        inspect.Parameter.KEYWORD_ONLY,
-        default=None,
-    ))
-    wrapper.__signature__ = sig.replace(parameters=params)
-    return wrapper
-```
-
-the wrapper's signature now includes `_filter`. IDEs and schema generators see it.
-
-from [pdsx/mcp/filterable.py](https://github.com/zzstoatzz/pdsx/blob/main/src/pdsx/mcp/filterable.py)
-
 ## argparse for CLIs
 
 argparse is stdlib. subparsers with aliases give you unix-style commands:
···
 
 console = Console()
 ```
-
-## lowercase aesthetic
-
-docstrings, comments, and output in lowercase:
-
-```python
-"""list records in a collection."""
-
-def list_records(collection: str) -> list[dict]:
-    """list records from the specified collection.
-
-    args:
-        collection: the collection to list from
-
-    returns:
-        list of record dictionaries
-    """
-```
-
-consistent voice throughout.
 
 sources:
 - [pdsx](https://github.com/zzstoatzz/pdsx)