Live-check: multi-registry v2 attribute lookup

[jerbly]

Fixes #1658

Fix 1 - always use the matched signal's attribute definitions first
Fix 2 - use the dependency registries to find attribute definitions when #1671 lands

[opentelemetry-pr-dashboard]

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Waiting on the author · refreshed 2026-08-04 02:01 UTC

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[codecov]

Codecov Report

❌ Patch coverage is 84.21053% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.4%. Comparing base (f7b63a0) to head (351a468).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/weaver_live_check/src/lib.rs	80.0%	6 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1665   +/-   ##
=====================================
  Coverage   81.4%   81.4%           
=====================================
  Files        131     131           
  Lines      11714   11763   +49     
=====================================
+ Hits        9538    9585   +47     
- Misses      2176    2178    +2     

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