fix(duplicates): filter deferred authoring queue items

[mjmirza]

Summary

Filter out queue entries with status == "deferred" in tools/check-duplicates.py during duplicate analysis. Inactive or permanently deferred entries in docs/AUTHORING-QUEUE.json previously triggered false-positive queue collision errors against published patterns and caused strict duplicate checks (--strict / --check / make duplicates) to fail on main.

Details & Verification

• Duplicate Risk Demonstrated: Deferred entries (e.g., windowing in docs/AUTHORING-QUEUE.json) are on-hold/deferred items that are not active candidates for authoring. When checked against published entries (e.g. virtual-list.md), they produced false-positive collision alerts.
• Real Examples: patterns/24-stream-processing/windowing.md in docs/AUTHORING-QUEUE.json is marked "status": "deferred". Before this fix, python3 tools/check-duplicates.py --check failed with a QUEUE COLLISION error against patterns/13-frontend-ui/virtual-list.md.
• Historical Examples: Deferred entries in AUTHORING-QUEUE.json record human governance decisions. Checking them as active queue items incorrectly flags known deferred decisions.
• Current Detection Mechanisms: Multi-pass detector (tools/check-duplicates.py) normalizing terms and checking queue vs published and historical commits.
• Exact Uncovered Failure Mode: Unfiltered reading of docs/AUTHORING-QUEUE.json loaded deferred entries as active queue candidates.
• Why This Improvement Is New: Specifically filters q.get("status") != "deferred" in analyze_repository, aligning duplicate detection with next-batch.py queue conventions.
• Historical Anti-Duplication Search: Checked commit history and remote branches. This targeted fix ensures clean CI and local execution without mutating authoring queue records.
• Test Corpus: 890 published patterns, 3 authoring queue items (all deferred), and unit tests in tools/check-duplicates-test.py.
• False Positives: Resolved false-positive collisions on deferred items.
• False Negatives: None; all active queue entries remain fully validated against published and historical entries.
• Performance Cost: Negligible (O(N) single-pass list filtering).
• CI Cost: Zero added overhead.
• Security Implications: Pure Python validator change; no external dependencies or privilege changes.
• Rollback: Simple git revert of tools/check-duplicates.py and tools/check-duplicates-test.py.
• Confidence Score: 98/100.
• Actual Test Output: 12 tests in check-duplicates-test.py passed OK; make test passed 22 tests OK.
• Metadata: Respects standard repository conventions and CODEOWNERS.
• Reviewer Focus: tools/check-duplicates.py and tools/check-duplicates-test.py.

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PR created automatically by Jules for task 10706301809477118493 started by @mjmirza

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