fix TypeError when a hostless target is sorted against a /32

[liquidsec]

Fixes #3390

The hostless sort sentinel in Target.add() was (0, 0), but host_size_key() returns (size, str). An explicitly-masked single address has size 0, so batching a hostless entry (BLACKLIST_REGEX) with a /32 or /128 tied on the first element and compared 0 against a str:

ScanBlacklist("RE:test", "1.2.3.4/32")
# TypeError: '<' not supported between instances of 'int' and 'str'

Reachable with no user-written RE: at all, since the spider preset ships a blacklist regex:

bbot -t example.com -p spider --blacklist 1.2.3.4/32

Changes the sentinel to (0, ""). Hostless entries are dropped before the radix tree (_add returns early on host is None), so their sort position is irrelevant and only the type matters.

Adds a regression test covering /32 and /128 batched with hostless entries in a single add(), plus a mixed batch of every host form.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90%. Comparing base (9d516e8) to head (90754a4).

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #3391   +/-   ##
=====================================
+ Coverage     90%     90%   +1%     
=====================================
  Files        454     454           
  Lines      46937   46949   +12     
=====================================
+ Hits       42196   42213   +17     
+ Misses      4741    4736    -5     

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[github-actions]

📊 Performance Benchmark Report

Comparing dev (baseline) vs hostless-sort-sentinel (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	3.81ms	3.85ms	+1.0% ⚪	✅
Bloom Filter Large Scale Dns Brute Force	15.63ms	15.49ms	-0.9% ⚪	✅
Large Closest Match Lookup	359.58ms	374.44ms	+4.1% ⚪	✅
Realistic Closest Match Workload	195.93ms	198.19ms	+1.2% ⚪	✅
Event Memory Medium Scan	1403 B/event	1405 B/event	+0.1% ⚪	✅
Event Memory Large Scan	1527 B/event	1527 B/event	+0.0% ⚪	✅
Event Validation Full Scan Startup Small Batch	413.99ms	415.30ms	+0.3% ⚪	✅
Event Validation Full Scan Startup Large Batch	557.54ms	560.72ms	+0.6% ⚪	✅
Make Event Autodetection Small	26.51ms	26.65ms	+0.5% ⚪	✅
Make Event Autodetection Large	272.03ms	272.90ms	+0.3% ⚪	✅
Make Event Explicit Types	11.99ms	11.83ms	-1.4% ⚪	✅
Excavate Single Thread Small	4.500s	4.417s	-1.8% ⚪	✅
Excavate Single Thread Large	10.370s	10.316s	-0.5% ⚪	✅
Excavate Parallel Tasks Small	4.562s	4.484s	-1.7% ⚪	✅
Excavate Parallel Tasks Large	6.663s	6.668s	+0.1% ⚪	✅
Intercept Throughput Small	901.30ms	891.09ms	-1.1% ⚪	✅
Intercept Throughput Medium	889.67ms	891.45ms	+0.2% ⚪	✅
Dns Throughput Quiet	2.871s	2.840s	-1.1% ⚪	✅
Dns Throughput Loaded	1.878s	1.878s	+0.0% ⚪	✅
Dns Throughput Inherited	2.805s	2.624s	-6.5% ⚪	✅
Is Ip Performance	2.28ms	2.34ms	+2.2% ⚪	✅
Make Ip Type Performance	238.34µs	237.10µs	-0.5% ⚪	✅
Mixed Ip Operations	2.38ms	2.39ms	+0.8% ⚪	✅
Memory Use Web Crawl	1.0 MB	1.0 MB	-1.0% ⚪	✅
Memory Use Subdomain Enum	28.3 MB	28.3 MB	+0.0% ⚪	✅
Memory Use Deep Chain	5.0 MB	5.0 MB	+0.0% ⚪	✅
Memory Use Parallel Chains	13.3 MB	12.2 MB	-8.5% ⚪	✅
Scan Throughput 100	3.046s	2.882s	-5.4% ⚪	✅
Scan Throughput 1000	21.359s	22.554s	+5.6% ⚪	✅
Typical Queue Shuffle	5.40µs	5.37µs	-0.7% ⚪	✅
Priority Queue Shuffle	26.10µs	26.32µs	+0.9% ⚪	✅

🎯 Performance Summary

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

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🐍 Python Version 3.11.16