Automatic git commits for changes.

[tcdent]

• Initialize a new git repo if the project doesn't have one.
• Start a transaction when we make modifications and create one commit per command run.
• Commit changes when we modify the user's project.
• Commit unsaved changes before we make a modification.
• Use agentstack.json flag to disable git at the project level.
• Use CLI flag to disable git.

[codecov]

Codecov Report

Attention: Patch coverage is 72.15909% with 49 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
agentstack/cli/init.py	8.33%	11 Missing ⚠️
agentstack/cli/tools.py	23.07%	10 Missing ⚠️
agentstack/cli/agents.py	42.85%	8 Missing ⚠️
agentstack/main.py	0.00%	7 Missing ⚠️
agentstack/cli/cli.py	33.33%	6 Missing ⚠️
agentstack/cli/tasks.py	50.00%	6 Missing ⚠️
agentstack/cli/templates.py	0.00%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[tcdent]

I like the idea of branches to manage major diversions, but let's do that in another PR so this doesn't get unwieldy.