rust-guard: merge duplicate search_issues/search_pull_requests arms; narrow labels pub use

[Copilot]

Two maintenance improvements to rust-guard: eliminate a duplicated match arm that required every future change to be applied twice, and narrow the labels module's re-export surface by removing low-level JSON utilities that were only ever used internally.

Changes

• labels/tool_rules.rs — Merge the byte-for-byte identical "search_issues" and "search_pull_requests" match arms into one, using the in-scope tool_name for the desc prefix:

  // Before: two identical ~14-line arms
  "search_issues" => { desc = format!("search_issues:{}", s_repo_id); ... }
  "search_pull_requests" => { desc = format!("search_pull_requests:{}", s_repo_id); ... }
  
  // After: single arm, same output strings
  "search_issues" | "search_pull_requests" => {
      desc = format!("{}:{}", tool_name, s_repo_id);
      ...
  }

• labels/mod.rs — Remove get_str_or, get_nested_str, get_bool_or, make_item_path, and has_author_association from the top-level pub use helpers::{...} block; add explicit imports for them inside #[cfg(test)] mod tests where they are actually consumed. These utilities are never referenced outside the labels/ submodule tree.

[Copilot]

Pull request overview

Maintenance refactor in rust-guard to reduce duplication in tool labeling logic and to narrow the public re-export surface of the labels module.

Changes:

• Merged identical search_issues and search_pull_requests match arms into a single combined arm in apply_tool_labels.
• Reduced labels public API by removing internal JSON helper utilities from pub use, and imported them explicitly in the test module where needed.

Show a summary per file

File	Description
guards/github-guard/rust-guard/src/labels/tool_rules.rs	Deduplicates search tool match arms while preserving desc output via tool_name.
guards/github-guard/rust-guard/src/labels/mod.rs	Narrows pub use helpers::{...} surface and fixes test-only usage with explicit helpers imports.

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• Files reviewed: 2/2 changed files
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