fix: add broader dedup search before fallback issue creation

[alex-solovyev]

Summary

• Adds a GitHub search-based duplicate detection check in claim-task-id.sh before the fallback gh issue create path
• Extracts the descriptive part of the title (stripping prefixes like t1344:, coderabbit:, etc.) and searches all issues (open + closed) for matches
• Returns the existing issue number instead of creating a duplicate when a match is found

Problem

create_github_issue() line 520 had a fallback that created bare GitHub issues with zero duplicate detection. The primary path via issue-sync-helper.sh push has dedup, but only matches startswith("tNNN:") — missing issues with different title prefixes. When the helper failed, the fallback created duplicates unconditionally (observed: #2421 duplicated #2410).

Fix

Before the fallback gh issue create, the new code:

1. Gets the repo slug via gh repo view
2. Strips the title prefix to get the descriptive keywords
3. Searches all issues via gh issue list --search (full-text, not prefix-only)
4. Returns the existing issue number if found, skipping creation

This is belt-and-suspenders alongside the intelligence-layer fix in PR #2446.

Verification

• ShellCheck: zero violations (shellcheck -x)
• Change is additive — only adds a guard before the existing fallback path
• All error paths handled with 2>/dev/null || echo "" to avoid breaking the fallback

Closes #2447

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📥 Commits

Reviewing files that changed from the base of the PR and between 07ef131 and 0eaec8d.

📒 Files selected for processing (1)

• .agents/scripts/claim-task-id.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bugfix/claim-task-id-dedup

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[github-actions]

🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 36 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Fri Feb 27 05:03:11 UTC 2026: Code review monitoring started
Fri Feb 27 05:03:11 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 36

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 36
• VULNERABILITIES: 0

Generated on: Fri Feb 27 05:03:14 UTC 2026

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Generated by AI DevOps Framework Code Review Monitoring

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud