[Repo Assist] refactor(rust-guard): add scope_names constants and replace bare string literals

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Summary

Closes #4846

Adds a pub mod scope_names submodule to labels/constants.rs with three constants — GITHUB, USER, and GLOBAL — and replaces all 15 bare scope string literals across the codebase with these constants.

Root Cause

Scope tokens ("github", "user", "global") were used as bare string literals in 15 places across lib.rs, labels/tool_rules.rs, and labels/helpers.rs. A typo (e.g. "Github") in any of these would silently produce wrong DIFC labels with no compiler error.

Fix

// labels/constants.rs — new submodule following established pattern
pub mod scope_names {
    pub const GITHUB: &str = "github";
    pub const USER:   &str = "user";
    pub const GLOBAL: &str = "global";
}

All 15 call sites replaced:

• labels/helpers.rs — project_github_label
• labels/tool_rules.rs — 10 baseline_scope/integrity call sites
• lib.rs — infer_scope_for_baseline, blocked override path, metadata path, 2 test assertions

Trade-offs

• Follows the existing label_constants, policy_integrity, and field_names submodule pattern — no new convention introduced
• Typo safety: misspelled scopes are now caught at compile time
• Discoverability: grep scope_names:: finds every usage

Test Status

✅ Rust tests: 345/345 passed (cargo test)

⚠️ Go build/tests: Infrastructure failure — Go toolchain download blocked by network firewall. Changes are Rust-only; no Go files modified.

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[Copilot]

Pull request overview

This PR centralizes the Rust guard’s reserved scope tokens ("github", "user", "global") into a scope_names constants module and updates several labeling call sites to use those constants, reducing the risk of silent typos that would change DIFC labeling behavior.

Changes:

• Added labels::constants::scope_names::{GITHUB, USER, GLOBAL}.
• Replaced several hard-coded scope token literals in lib.rs, labels/tool_rules.rs, and labels/helpers.rs with scope_names::*.
• Updated a few tests/assertions to reference scope_names::GITHUB.

Show a summary per file

File	Description
guards/github-guard/rust-guard/src/lib.rs	Uses scope_names for inferred baseline scope and metadata/blocked-tool scope handling.
guards/github-guard/rust-guard/src/labels/tool_rules.rs	Replaces hard-coded "user"/"github" baseline scope + integrity scoping with scope_names constants.
guards/github-guard/rust-guard/src/labels/helpers.rs	Updates project_github_label to use scope_names::GITHUB.
guards/github-guard/rust-guard/src/labels/constants.rs	Introduces the new scope_names module with the canonical reserved scope tokens.

Copilot's findings

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• Files reviewed: 4/4 changed files
• Comments generated: 3

[lpcox]

@copilot address the review feedback

[Copilot]

@copilot address the review feedback

Addressed all three review findings in 52bf1c5:

1. Clarified scope_names doc comment — now explicitly states these are the canonical reserved scope tokens and that dynamic scopes (e.g. owner, owner/repo) also exist at runtime.
2. Replaced remaining bare "user" literals — updated response_items.rs, response_paths.rs, and the mod.rs test assertions to use scope_names::USER.
3. Fixed misleading comment in tool_rules.rs:680 — changed "writer (global)" to "writer (github)" to match the scope_names::GITHUB scope used in the code.