v0.63.0: GPT-5.4, Frecency Favorites & Diff Performance

Highlights

• GPT-5.4 default model — The Codex harness now defaults to GPT-5.4 with updated pricing support.
• Frecency-ranked file favorites — The @file favorites list now uses time-decayed frecency scoring instead of raw counts, so recently used files stay relevant.
• Stale favorite pruning — Files that no longer exist on disk are automatically removed from your favorites list.
• Diff performance for large files — Lock files, generated files, and files with 10k+ lines are detected early and skipped, preventing UI freezes in the Changes and Git Log trays.

Other improvements

• "Too large to display" message improved to "File too large to diff" for clarity.