Filter out useless PTRs by default

[TheTechromancer]

Summary

• Wire up the existing (but dead) dns.filter_ptrs config option to prevent PTR-derived hostnames from being promoted to in-scope
• When scanning IP ranges (e.g. 1.2.3.0/24), rDNS results like 1-2-3-4.ptr.randomothercorp.com now stay as affiliates (scope_distance=1) instead of being treated as fully in-scope, preventing subdomain enumeration modules from blowing up against every unrelated PTR parent domain
• PTR-derived events are tagged with ptr for easy identification
• Behavior can be disabled with dns.filter_ptrs: false to restore the old behavior

[github-actions]

📊 Performance Benchmark Report

Comparing 3.0 (baseline) vs filter-ptrs (current)

📈 Detailed Results (All Benchmarks)

📋 Complete results for all benchmarks - includes both significant and insignificant changes

🧪 Test Name	📏 Base	📏 Current	📈 Change	🎯 Status
Bloom Filter Dns Mutation Tracking Performance	4.19ms	4.19ms	+0.0% ⚪	✅
Bloom Filter Large Scale Dns Brute Force	17.31ms	17.68ms	+2.1% ⚪	✅
Large Closest Match Lookup	358.09ms	341.37ms	-4.7% ⚪	✅
Realistic Closest Match Workload	189.21ms	190.86ms	+0.9% ⚪	✅
Event Memory Medium Scan	1782 B/event	1777 B/event	-0.3% ⚪	✅
Event Memory Large Scan	1768 B/event	1768 B/event	+0.0% ⚪	✅
Event Validation Full Scan Startup Small Batch	411.27ms	420.57ms	+2.3% ⚪	✅
Event Validation Full Scan Startup Large Batch	569.80ms	580.47ms	+1.9% ⚪	✅
Make Event Autodetection Small	30.77ms	30.70ms	-0.2% ⚪	✅
Make Event Autodetection Large	314.07ms	311.50ms	-0.8% ⚪	✅
Make Event Explicit Types	13.74ms	13.69ms	-0.4% ⚪	✅
Excavate Single Thread Small	3.944s	3.982s	+1.0% ⚪	✅
Excavate Single Thread Large	9.740s	9.447s	-3.0% ⚪	✅
Excavate Parallel Tasks Small	4.142s	4.130s	-0.3% ⚪	✅
Excavate Parallel Tasks Large	7.230s	7.228s	-0.0% ⚪	✅
Is Ip Performance	3.13ms	3.14ms	+0.2% ⚪	✅
Make Ip Type Performance	11.38ms	11.42ms	+0.3% ⚪	✅
Mixed Ip Operations	4.48ms	4.49ms	+0.2% ⚪	✅
Memory Use Web Crawl	50.2 MB	47.4 MB	-5.5% ⚪	✅
Memory Use Subdomain Enum	19.3 MB	19.3 MB	+0.0% ⚪	✅
Scan Throughput 100	8.455s	7.891s	-6.7% ⚪	✅
Scan Throughput 1000	42.815s	41.032s	-4.2% ⚪	✅
Typical Queue Shuffle	66.03µs	65.54µs	-0.7% ⚪	✅
Priority Queue Shuffle	746.62µs	728.04µs	-2.5% ⚪	✅

🎯 Performance Summary

✅ No significant performance changes detected (all changes <10%)

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🐍 Python Version 3.11.15

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91%. Comparing base (677f7c0) to head (8ea7d66).
⚠️ Report is 18 commits behind head on 3.0.

Additional details and impacted files

@@          Coverage Diff           @@
##             3.0   #3039    +/-   ##
======================================
- Coverage     91%     91%    -0%     
======================================
  Files        440     440            
  Lines      37550   37697   +147     
======================================
+ Hits       33987   34112   +125     
- Misses      3563    3585    +22     

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