fix: perf(ignore): don't search subdirs for git/ignore files if max depth is reached (#2565)

[krapcys1-maker]

Fixes #2565

Summary

Addresses #2565 in BurntSushi/ripgrep with a minimal, targeted change.

Problem

When searching for git/ignore files (the one set with .ignore .git_ignore .git_exclude), the crate should not search the sub-directories if its at the max depth

What changed

• crates/ignore/src/walk.rs

Solution

Apply focused code changes in crates/ignore/src/walk.rs to remove the reported behavior from #2565.

Why

Before: users hit the behavior described in #2565. After: behavior should follow issue expectations while keeping changes minimal and auditable.

Tests

• cargo check --workspace
• cargo test -p grep-printer --lib -- --nocapture

Scope

• Changed files (1): crates/ignore/src/walk.rs
• Root-cause gate verdict: confirmed
• Replay stability: not_run

Validation

• Local validation gate verdict: confirmed (risk: low).
• Passed check in 1.1s: cargo check --workspace
• Passed check in 1.8s: cargo test -p grep-printer --lib -- --nocapture

Limitations

Deterministic multi-replay was not executed in this run (replay_stability_status=not_run).