Cap hook output at terminal width to prevent wrapping

Previously, _compute_cols() would calculate the ideal column width based
on hook names and message lengths, with a minimum of 80 columns. However,
it didn't consider the actual terminal width, causing the "Passed/Failed"
status to wrap to the next line on narrower terminals.

This change:
- Adds terminal width detection using shutil.get_terminal_size()
- Caps the column width at the terminal width to prevent wrapping
- Maintains the minimum of 80 columns when terminal is wide enough
- Falls back to 80 columns if terminal size cannot be determined

The algorithm now ensures output always fits within the terminal width,
similar to how pytest handles its output formatting.

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

Co-Authored-By: Kamil Monicz <kamil@monicz.dev>
Co-Authored-By: Claude <noreply@anthropic.com>

pre_commit/commands/run.py

@@ -6,6 +6,7 @@ import functools
 import logging
 import os
 import re
+import shutil
 import subprocess
 import time
 import unicodedata
@@ -247,7 +248,15 @@ def _compute_cols(hooks: Sequence[Hook]) -> int:
         name_len = 0
 
     cols = name_len + 3 + len(NO_FILES) + 1 + len(SKIPPED)
-    return max(cols, 80)
+    cols = max(cols, 80)
+
+    # Cap at terminal width to prevent wrapping
+    try:
+        term_width = shutil.get_terminal_size().columns
+    except OSError:
+        term_width = 80
+
+    return min(cols, term_width)
 
 
 def _all_filenames(args: argparse.Namespace) -> Iterable[str]: