rm-hull / git-commit-summary / 28684273968

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feat: add support for git prepare-commit-msg hook (#142)

* feat: add support for git prepare-commit-msg hook

Introduced `--install-hook` and `--uninstall-hook` flags to automate
commit message generation via `git commit`. The application now detects
a commit message file argument, allowing it to write generated content
directly to the git buffer instead of triggering an internal commit.

```mermaid
sequenceDiagram
    participant User
    participant Git
    participant Tool

    User->>Git: git commit
    Git->>Tool: trigger prepare-commit-msg
    Tool->>Tool: Generate message
    Tool->>Git: Write message to $1
    Git->>User: Display editor with message
```

* refactor: remove unnecessary exePath from InstallHook

Removed the unused `exePath` parameter from the `InstallHook` function
to simplify the API and align with the current implementation, which
determines the git directory dynamically.

* feat: prevent recursive hooks during commit

Add `GIT_COMMIT_SUMMARY_IGNORE_HOOK` environment variable to prevent
infinite loops when `git-commit-summary` triggers a git commit command
that would otherwise invoke the `prepare-commit-msg` hook again.

```mermaid
sequenceDiagram
    participant User
    participant CLI as git-commit-summary
    participant Git
    participant Hook as prepare-commit-msg

    User->>CLI: Run git commit-summary
    CLI->>Git: git commit (env: IGNORE_HOOK=1)
    Git->>Hook: Execute hook
    Hook->>Hook: Check IGNORE_HOOK
    Hook-->>Git: Exit 0 (Ignore)
    Git-->>CLI: Commit success
```

* Update internal/setup/hooks.go

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

* Update internal/setup/hooks.go

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

* Update internal/setup/hooks.go

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

* fix: improve git directory path clean... (continued)

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