fix: unify extract-log-errors output behavior for empty manifests

[github-actions]

Summary

This PR resolves issue #812 by removing redundant empty-branch output handling in scripts/extract-log-errors.py and routing both empty and non-empty executions through the same emit_output(...) path.

What changed

• Removed emit_empty_output(...).
• Refactored main() so it always builds a summary and always calls emit_output(summary, args.output).
• Preserved existing stderr messaging (No log files found.) for empty inputs.
• Kept run metadata attachment for non-empty log scans unchanged.

Tests

• Added assertions in tests/test_extract_log_errors.py to verify --output prints the output path for both:
  • non-empty manifest logs
  • empty manifest logs
• Ran:
  • /tmp/gh-aw/agent/venv/bin/python -m pytest -q tests/test_extract_log_errors.py
  • Result: 4 passed

Issue linkage

Closes #812.

Note

🔒 Integrity filtering filtered 31 items

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• issue:[complexity] Code complexity findings (2026-03-26) #812 (issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[complexity] Code complexity findings (2026-03-26) #812 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:CodeRabbit and GitHub actions both react to /ai command, causing duplicate work #811 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[bug-hunter] fetch-workflow-logs.py --last 0 still returns one run #810 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[product-manager-impersonator] Quick-Setup Permission Preflight #809 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[information-architecture] Full-loop stale issues setup hides shared stale-label configuration #808 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[agent-efficiency] Recurring checkout ref failures across trigger workflows in last 7 days #807 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[autonomy-atomicity] Fixed quick-setup branch name creates cross-run branch contention risk #806 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[docs-patrol] Add missing Branch Actions Detective docs page referenced by docs nav #804 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:Fix grammar defects in prompts and setup script messages #803 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[text-auditor] Fix grammar defects in workflow prompts and setup script messages #801 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[ux-design-patrol] PR Actions Detective docs page has stale terminology and add-comment limit #800 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:PRs created by Mention on Issue workflow lack thorough validation and clear reasoning #799 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[bug-hunter] extract-log-errors counts missing log files as error matches, inflating failure summaries #797 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[product-manager-impersonator] Example Trigger Lint Gate #796 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• issue:[project-summary] Project Summary - 2026-03-25 #795 (list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".)
• ... and 15 more items

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What is this? | From workflow: Trigger Code Complexity Detector

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