fix(copilot): bound agent CLI grep matching

[waleedlatif1]

Summary

• Use the shared linear-time regex helper for agent CLI grep, with literal matching for unsupported patterns.
• Yield during scans and enforce a five-second scan budget after resource reads so searches can be cancelled and incomplete counts are not reported as complete.
• Bound context collection to the remaining output limit, skip overlapping windows, and reuse match results when rendering output.

Type of Change

• Bug fix

Testing

• 236 tests across universal-grep.test.ts, linear-regex.test.ts, and operations.test.ts.
• Four regressions verified against the original code and by independently removing each guard.
• Context-window regression verifies a dense file completes within the scan budget while preserving output ordering and the full match count.
• App type-check, lint, block-registry check, check:audits, and docs-manifest check.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing (new tests pass the test-audit authoring gate)
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 26, 2026 9:18pm UTC

[greptile-apps]

Confidence Score: 5/5

[High risk] Adds regex validation and scan-time limits to grep matching.

The PR appears safe to merge; no new actionable issue was found, and the previous context-expansion finding is resolved.

Summary

The PR switches agent CLI grep to bounded regex matching, adds scan cancellation and a time budget, and now caps context expansion while continuing to count matches. The latest change adds a dense-file regression test for overlapping context windows.

_{Reviews (2) · Last reviewed commit: "fix(copilot): bound grep context expansi..."}

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}