v0.49.0: CLI Axiom skill, custom model fixes, and bug fixes

New features

- CLI Axiom skill - New skill for querying CLI metrics and logs with relevant datasets and fields

Improvements

- Custom model requests - Custom models now properly map to equivalent built-in models for correct request formatting

Bug fixes

- iTerm scrollback clearing - Fixed scrollback clearing for iTerm users with "Disable E3 scrollback clearing" preference enabled
- Memory leak fix - Fixed memory leak by cleaning up Performance API entries and hinting Bun GC
- Session title generation - Fixed session title generation for empty strings
- Warmup requests - Warmup requests no longer consume unnecessary tokens by disabling thinking budget
- Light mode submenus - Fixed light mode display issues for submenus
- Linux autoupdate - Fixed autoupdate issues on Linux