fix: diff shows files as deleted when run from subdirectory - #120

Walkthrough

Adds a repo_root() accessor to the VcsBackend trait and implements it for Git and Jj backends. Updates get_new_content in the git diff command to resolve working-tree file reads relative to the repository root when available, and adds a test for reading from a subdirectory.

Changes

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• feat(vcs): migrate GitBackend from CLI to git2 (libgit2) #98: Modifies Git backend and diffs handling; closely related to adding repo_root() and its use in diff reading.
• feat(vcs): add VcsBackend trait and VCS detection module #88: Introduced or earlier-modified VcsBackend and backend modules that this change extends with repo_root().
• feat(vcs): implement GitBackend for git CLI integration #89: Adds repo_root() to VcsBackend and updates git usages; overlaps with this PR's trait and backend edits.

Suggested reviewers

• jnsahaj

Poem

🐰 I hop through branches, roots, and leaves,
I join your paths where the repository breathes,
From subdir shadows I fetch the new light,
No more wrong turns in the filesystem night,
Happy commits, and code that delights! 🥕

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