Moves the Go structs for LLM responses into the `ai_prompts.go` file, alongside the prompts that generate them.
The structs have been renamed to better associate them with their corresponding prompt variables:
- `GroupingResponse` is now `InitialGroupingResponse`
- `AIGroupSummaryResponse` is now `SummaryResponse`
- `AISubGroupingResponse` is now `SubGroupingResponse`
This change improves maintainability by keeping the prompt, its expected response type, and its schema in the same file.
This change addresses the creation of too many similar primary groups by adding an LLM-powered consolidation step.
The GroupAIEntries function now processes entry chunks in parallel. A new consolidatePrimaryGroups function is introduced, which calls an LLM to merge the initial, numerous group titles into a smaller set. The logic preserves any group titles that the LLM fails to map, and this behavior is verified in a new unit test.
Additionally, all prompt constants have been moved from ai.go into a new internal/digest/view/ai_prompts.go file.
eleith