Consolidate duplicate authorization-server techniques

[fkautz]

Summary

• consolidate SAF-T1306 into canonical SAF-T1009
• retain SAF-T1306 as a permanent deprecated compatibility ID with provenance
• reconcile tactic, framework relationship, detection registry, catalog, and traceability metadata
• retain SAF-T1302 and SAF-T1307 as a documented parent/specialization pair rather than merging them

Validation

• python3 -m unittest discover -s scripts -p 'test_*.py'
• python3 scripts/validate-technique-research.py --all
• python3 scripts/validate-framework-model.py
• python3 scripts/generate-technique-catalog.py --check
• python3 scripts/validate-detection-registry.py
• git diff --check