Enhance context for AI commit messages

[PatrickRuddiman]

Summary

• provide extra context lines around small diffs
• expose new GetStagedChangesWithContextAsync helper
• mention context-aware behaviour in README

Testing

• dotnet restore Write-Commit.sln
• dotnet build Write-Commit.sln --no-restore

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https://chatgpt.com/codex/tasks/task_e_686bd644abd8832aafc6716082708f2d

[Copilot]

Pull Request Overview

This PR enhances the commit message generation tool by adding context-aware diff support, allowing small diffs to include surrounding lines for better AI summaries.

• Expose a new GetStagedChangesWithContextAsync helper for adjustable unified context
• Update Program.cs to detect small diffs and fetch extra context lines when needed
• Update README.md to mention the new context-aware feature

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
Services/GitService.cs	Added GetStagedChangesWithContextAsync and updated GetStagedChangesAsync to accept a verbose flag
README.md	Documented the context-aware feature
Program.cs	Detects small diffs (≤2 files, <20 lines) and invokes the new helper

Comments suppressed due to low confidence (2)

Services/GitService.cs:31

• Add unit tests to cover GetStagedChangesWithContextAsync to ensure the new context-aware diff behavior is verified.

    public async Task<string> GetStagedChangesWithContextAsync(int contextLines, bool verbose = false)

README.md:14

• [nitpick] Consider updating the Quick Start or Usage section to explain how to configure the number of context lines and how to enable context-aware behavior in the CLI.

- 🔍 **Context-aware** - Adds surrounding code lines when diffs are very small for better summaries