feat: control Git commit creation in anchor init (fixes #23)

[Tanishq1030]

Description

This PR separates Anchor project initialization from automatic Git operations during anchor init, giving the developer explicit control over version control modifications.

Acceptance Criteria

• Remove automatic commit creation during anchor init.
• Require explicit confirmation before performing Git operations.
• Continue generating all Anchor project files regardless of Git choice.
• Preserve existing initialization behavior for non-Git projects.
• Documentation updated to describe the new workflow.

Changes

• CLI (anchor/cli.py):
  • Replaced automatic Git commit generation with an interactive prompt at the end of the initialization step:

    Anchor has finished initialization.
    Would you like to create an initial governance commit? [Y/n]
    

  • If the user approves, stages the configuration and manifest files (.gitignore, .pre-commit-config.yaml, .anchor/ directory) and runs the initial commit.
  • If the user declines, no version control operations are performed.
  • Dynamically updates the console initialization summary based on whether the initial commit was selected.
• Unit Tests (tests/unit/test_init_git.py): Added a test suite using mocked click callbacks and system properties:
  • Validates Git commit creation and file staging when the prompt is accepted.
  • Validates that version control remains untouched when the prompt is declined.

Related Issues

Fixes #23

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