rust-guard: remove per-item secrecy Vec clones in PR/issue labeling

[Copilot]

label_response_items was still deep-cloning secrecy label vectors on every item for list_pull_requests and list_issues, unlike other response-item arms that already use SharedLabels. This update aligns those hot paths with the shared-label pattern and removes repeated default repo-name String cloning in list_issues via borrowed Cow<str>.

• Shared secrecy labels in list_pull_requests

  • Hoist secrecy once per response into SharedLabels.
  • Use cheap Arc clones (secrecy_shared.clone()) inside the loop for non-search calls.
  • Keep search behavior unchanged by converting per-repo secrecy directly into SharedLabels.

• Shared secrecy labels in list_issues

  • Apply the same hoist-and-share pattern as PRs.
  • Replace per-item secrecy.clone() with secrecy_shared.clone() in non-search calls.

• Borrow default repo scope in list_issues

  • Switch per-item repo_full_name to Cow<'_, str>.
  • Borrow default_repo_full_name when item repo metadata is absent; own only when extracted from item data.

let secrecy_shared: SharedLabels = secrecy.into();

secrecy: if tool_name == "search_issues" {
    repo_visibility_secrecy_for_repo_id(&repo_full_name, ctx).into()
} else {
    secrecy_shared.clone()
},

[Copilot]

Pull request overview

This PR optimizes Rust guard response-item labeling for pull requests and issues by avoiding repeated deep clones of secrecy labels in per-item loops.

Changes:

• Converts per-response secrecy vectors into SharedLabels once and reuses cheap clones for PR and issue item labeling.
• Uses Cow<str> in issue labeling to borrow the default repo scope when item repo metadata is absent.
• Adds tests asserting GraphQL PR/issue responses without embedded repo metadata fall back to tool argument repo scope.

Show a summary per file

File	Description
guards/github-guard/rust-guard/src/labels/response_items.rs	Refactors PR/issue secrecy label reuse and issue repo-name fallback allocation behavior.
guards/github-guard/rust-guard/src/labels/mod.rs	Adds assertions covering fallback descriptions for GraphQL PR and issue response labeling.

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• Files reviewed: 2/2 changed files
• Comments generated: 0