Title: Regression in v0.0.94+: explicit file comparison broken when run inside a git repository

[harvey251]

Summary
Starting with v0.0.94, passing two explicit file paths to openapi-changes summary no longer performs a left/right file comparison when the command is run from inside a git repository. Instead, the tool silently switches to git history mode and fails with:

v0.0.93 works correctly with the same invocation.

Steps to reproduce
v0.0.93 → correct left/right diff output
v0.0.94 / v0.0.95 → cannot compare files, nothing was extracted
Expected behaviour
When two file path arguments are supplied, the tool should use left/right file comparison mode regardless of whether the working directory is inside a git repository.

Actual behaviour
The tool detects the git repository in the working directory and overrides the explicit file arguments, switching to git history mode. Running from a temp directory outside the repo was also tested on v0.0.95 and fails identically, suggesting the mode-detection no longer respects explicit file arguments at all.

Workaround
Pin to v0.0.93:

Environment
Versions tested: 0.0.93 ✅, 0.0.94 ❌, 0.0.95 ❌
OS: macOS / Ubuntu 22.04 (CI runner)
Use case: CI pipeline comparing a PR branch openapi.json against the main branch openapi.json (two explicit file paths, not a git history walk)

[daveshanley]

Oh dear, fixing this.

[daveshanley]

fixed in v0.0.96

[harvey251]

Thank you so much