feat: baseline lib

[jif-oai]

This add with 2 entry point:

• reset_git_repository that takes a directory and set it as a new git root
• diff_since_latest_init this returns the diff for a given directory since the last reset_git_repository

[jif-oai]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

codex/codex-rs/git-utils/src/lib.rs

Lines 1 to 7 in ba9aa3b

	mod apply;
	mod branch;
	mod errors;
	mod ghost_commits;
	mod info;
	mod operations;
	mod platform;

Export the new baseline API from crate root

codex-rs/git-utils/src/baseline.rs adds reset_git_repository and diff_since_latest_init, but src/lib.rs never declares mod baseline; or re-exports these items. That makes the new feature unreachable to crate consumers and prevents its in-file tests from being compiled/run, contradicting the commit’s stated intent to add two entry points.

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