v0.0.73

• Renamed the /regenerate command to /revise with an optional edit
  subcommand, updating command handling, help text, and related tests.
• Added a new edit_text method that uses temporary files for external editor
  integration.
• Introduced a ModelMetadata struct to encapsulate model information,
  including capabilities, and added an UnknownModelError for clearer error
  handling.
• Implemented a can? method on ModelMetadata for capability checks and
  updated pull_model_unless_present to return a ModelMetadata instance.
• Updated the /model command to use the new exception class, display model
  capabilities in the information output, and refactored model selection logic.
• Enhanced error recovery in OllamaChat::Chat to handle both think mode and
  tools support, disabling both on error and improving the retry message.
• Updated tests to validate capability parsing, new command behavior, and error
  handling changes.