rm-hull / git-commit-summary / 28735302892

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feat: add configurable file ignore patterns (#147)

* feat: add configurable file ignore patterns

Introduce a `.gitcommitsummaryignore` system to exclude files from git
diffs. Exclusions are resolved from multiple locations (default, home,
XDG config, and project root) to provide better control over what is
analyzed by the LLM.

```mermaid
graph LR
    A[Default Patterns] --> D(Exclusion Resolver)
    B[~/.gitcommitsummaryignore] --> D
    C[./.gitcommitsummaryignore] --> D
    D --> E{Git Diff Args}
    E --> F[Excluded Files]
```

* Update internal/git/exclusions.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update internal/git/exclusions.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update internal/git/exclusions_test.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update internal/git/exclusions_test.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* docs: add documentation for exclusion file support

Update README and create `docs/exclusions.md` to explain how to use
`.gitcommitsummaryignore` to filter files during analysis.

```mermaid
graph LR
    A[Staged Changes] --> B{Filter via .gitcommitsummaryignore}
    B -->|Matches| C[Ignored]
    B -->|No Match| D[Sent to LLM]
    D --> E[Commit Summary]
```

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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