[Repo Assist] test(rust-guard): add list_commits tests for default-branch vs feature-branch integrity

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Summary

Adds two unit tests to response_paths.rs for the list_commits handler — the only response-path handler that had zero test coverage (identified in issue #6086, Improvement 2).

Why This Matters

The sha field in list_commits tool args drives is_default_branch_ref() → merged-level integrity promotion. This is a security-relevant decision: a regression that treats all commits as default-branch would silently over-elevate integrity labels, allowing feature-branch commits to be treated as if they had merged status.

Tests Added

Test	Scenario	Assertion
list_commits_default_branch_gets_merged_integrity	sha = "main"	default_labels.integrity contains merged:octocat/hello-world; items_path is None (root array)
list_commits_feature_branch_public_repo_has_no_merged_integrity	sha = "feature/my-branch"	default_labels.integrity has no merged: prefix; items_path is None

Both tests are self-contained and require no backend mocking (the is_repo_private backend returns None → false in #[cfg(test)]).

Test Status

running 413 tests
test result: ok. 413 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

(411 pre-existing + 2 new)

Closes #6086 (Improvement 2)

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[Copilot]

Pull request overview

Adds unit test coverage for the Rust guard’s path-based labeling of the list_commits tool response, specifically validating integrity behavior for default-branch vs feature-branch SHAs (a security-relevant distinction).

Changes:

• Added a test ensuring sha = "main" results in merged-level integrity on default_labels.
• Added a test ensuring a feature-branch sha in a public repo does not receive merged-level integrity.
• Both tests assert items_path is None for the root-array list_commits response shape.

Show a summary per file

File	Description
guards/github-guard/rust-guard/src/labels/response_paths.rs	Adds list_commits unit tests covering default-branch vs feature-branch integrity labeling and root-array items_path behavior.

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