fix(#98): generate one suggestion only

[h1alexbel]

ref #98

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PR-Codex overview

The focus of this PR is to refactor the codebase to use a singular "suggestion" instead of "suggestions" for clarity and consistency.

Detailed summary

• Refactored FormattedSummary to use suggestion instead of suggestions
• Updated Models to use suggestion instead of suggestions
• Added OneSuggestion class for a single suggestion in prompts
• Updated tests for FormattedSummary and OneSuggestion

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 11.59%. Comparing base (e7b9ae1) to head (7f7b67b).

Files	Patch %	Lines
src/prompts/one-suggestion.ts	0.00%	6 Missing :warning:
src/models.ts	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #100 +/- ## ========================================== + Coverage 10.43% 11.59% +1.15% ========================================== Files 36 37 +1 Lines 364 371 +7 Branches 36 36 ========================================== + Hits 38 43 +5 - Misses 326 328 +2 ```

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[h1alexbel]

@rultor merge

[rultor]

@rultor merge

@h1alexbel OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@h1alexbel Done! FYI, the full log is here (took me 8min)