feat(0.6.0): refined segment labels + early destination ASN lookup (BREAKING)

[dweekly]

feat: v0.5.1 – Replace BEYOND with TRANSIT/DESTINATION

Summary

Replaces the BEYOND segment in outputs with TRANSIT and DESTINATION. Library gains helpers to compute these refined segments based on destination ASN.

Changes

• Library

  • New ftr::EffectiveSegment enum and TracerouteResult::effective_segments() for refined segments (LAN, ISP, TRANSIT, DESTINATION, UNKNOWN).
  • TracerouteResult::path_labels() also available for finer control.
  • Backward-compatible: existing SegmentType unchanged.

• CLI

  • Text: Segment display shows TRANSIT or DESTINATION instead of BEYOND when enrichment allows determination.
  • JSON: segment field now emits TRANSIT/DESTINATION instead of BEYOND.

Rationale

Makes it easier to identify which parts of the route traverse transit providers versus the destination’s own network, aiding debugging, performance analysis, and visualization use cases.

Compatibility

• Library API is additive; 0.5.0 callers remain compatible (no enum breaking changes).
• CLI text/JSON replace BEYOND with refined labels when possible; UNKNOWN used when insufficient enrichment.

Tests/Quality

• Added unit test for role labeling logic and effective segments.
• cargo fmt and cargo clippy -- -D warnings clean.

Screenshots/Examples

 9 [TRANSIT] 203.0.113.1  12.345 ms [AS64500 - TRANSIT-NET, US]
10 [DESTINATION] 8.8.8.8  22.456 ms [AS15169 - GOOGLE, US]

Checklist

• Code compiles without warnings
• Tests updated and passing
• Backward compatibility verified
• Release notes added (RELEASE_NOTES_v0.5.1.md)

[codecov]

Codecov Report

❌ Patch coverage is 43.47826% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.56%. Comparing base (bd5d9d6) to head (8977b30).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/traceroute/fully_parallel_async_engine.rs	37.83%	23 Missing ⚠️
src/main.rs	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   58.93%   58.56%   -0.37%     
==========================================
  Files          29       29              
  Lines        1651     1687      +36     
==========================================
+ Hits          973      988      +15     
- Misses        678      699      +21     

Flag	Coverage Δ
unittests	58.56% <43.47%> (-0.37%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/traceroute.rs	100.00% <100.00%> (ø)
src/traceroute/result.rs	96.15% <ø> (ø)
src/main.rs	54.16% <57.14%> (-0.38%)	⬇️
src/traceroute/fully_parallel_async_engine.rs	60.48% <37.83%> (-2.02%)	⬇️

... and 1 file with indirect coverage changes

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