[devin-ai-integration]

Summary

Fixes code-scanning alert rb/polynomial-redos #1. AnnotateRoutes::Helpers.strip_annotations decided whether a line was still part of the route-map header with the unanchored line !~ /\s*#/, which backtracks quadratically on long whitespace runs. That regex matches exactly when the line contains #, so it becomes !line.include?('#'). The behaviour stays the same.

Adds a spec for header stripping and a long whitespace line. Ran it with the existing annotate_routes_spec.rb on Ruby 3.4 using a temporary Gemfile, because the repo's Ruby 2.7 toolchain wasn't available: 87 examples passed.

Link to Devin session: https://app.devin.ai/sessions/a9787919a905463b8434939e6587f7fe
Open in Devin Desktop: https://app.devin.ai/desktop/session/a9787919a905463b8434939e6587f7fe?variant=devin

[devin-ai-integration]

I'll fix CI failures and address comments from users with write access. I'll skip comments containing "(aside)".

• Disable automatic comment, CI, and merge conflict monitoring

[Copilot]

🟢 Approval recommended

No active review issues are identified for the route annotation stripping change.

No open issues 🎉

What changed in this PR

Addresses the polynomial-regex code-scanning alert in route annotation stripping while preserving existing behavior.

Changes:

• Replaces the unanchored regex with a direct # substring check.
• Adds specs for header removal and a long whitespace-only line, including an execution-time limit.

File	Description
spec/​lib/​annotate/​annotate_routes/​helpers_spec.rb	Adds functional and performance-regression coverage for annotation stripping.
lib/​annotate/​annotate_routes/​helpers.rb	Uses include? to avoid regex backtracking when detecting the header boundary.

_{Review effort: Balanced}

[Copilot]

🟢 Approval recommended

No active review issues remain for the change replacing regex matching with a literal # check in route annotation stripping.

No open issues 🎉

_{Review effort: Balanced}