add integration tests

[katbyte]

No description provided.

[katbyte]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Merged origin/main into the branch and resolved all conflicts:

• .github/workflows/test.yaml: Kept the integration test paths from the branch, updated to use actions/checkout@v7 and actions/setup-go@v7 with go-version-file from main.
• lib/gh/file.go: Kept RawURL support for mock servers in integration tests; fixed variable declaration (content, err :=).
• lib/gh/gh.go: Updated Repo.NewClient() to use github.WithEnterpriseURLs() instead of direct client.BaseURL assignment (which is no longer a field in go-github v89).
• lib/tc/request.go: Kept the baseURL() helper that supports custom URL schemes (needed for integration tests pointing at local mock servers).
• makefile: Kept the integration test target; merged .PHONY declarations from both sides.

Commit: 9d66447

[katbyte]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Merged the latest origin/main commits and resolved conflicts:

• cli/prs.go: Trivial whitespace conflict resolved.
• makefile: Adopted the new structure/help comments from main (##@ sections, help target, updated .PHONY); kept the integration test target from this branch.

Commit: 0a033c6

[mstroob]

LGTM