chore(cli): remove redundant module docstrings and __future__ imports from chart modules

Author: akhundMurad

pacta/cli/_ascii_chart.py

@@ -1,12 +1,3 @@
-"""
-ASCII chart rendering for terminal output.
-
-Provides simple chart rendering without external dependencies.
-"""
-
-from __future__ import annotations
-
-
 def render_line_chart(
     values: list[float],
     labels: list[str],

pacta/cli/_mpl_chart.py

@@ -1,11 +1,3 @@
-"""
-Matplotlib chart rendering for image export.
-
-This module requires matplotlib (install with `pip install pacta[viz]`).
-"""
-
-from __future__ import annotations
-
 from datetime import datetime
 from pathlib import Path