v0.7.1

This is primarily a patch release to expose Opus 4.5. Note that users can always try models before we "release" them by inputting the full model string via /model <model> or the model selector UI.

Also:

• Refined compaction prompt to focus on past, not future (0d923bf)
• Unified command handling between New Workspace creation and existing workspace chat pages (75c93e7)