refactor(test-validation): extract exclusions to TOML config and add tests

[aliersh]

Summary

Refactors the test validation script to externalize exclusion logic into a TOML config file, and adds full test coverage for validation functions.

This change improves maintainability and flexibility:

• Exclusions can now be updated via configuration, without touching Go code

• The TOML file serves as a single source of truth shared between the current Go-based validation and upcoming Python tooling for the AI Test Maintenance system

• This reduces duplication and risk of inconsistency, while making it easier to evolve both implementations in parallel

  Changes Made

  Core Refactor

  • Extracted exclusions to TOML: Moved all exclusion lists from inline Go arrays to exclusions.toml
  • Added TOML loading: Implemented loadExclusions() function with proper error handling
  • Maintained backward compatibility: All existing validation logic remains unchanged

  Test Coverage

  • Complete function coverage: Added tests for all main validation functions

  Files Modified

  • packages/contracts-bedrock/scripts/checks/test-validation/main.go - Core refactor to use TOML
  • packages/contracts-bedrock/scripts/checks/test-validation/main_test.go - Added test suite
  • packages/contracts-bedrock/scripts/checks/test-validation/exclusions.toml - New config file

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.83%. Comparing base (2503148) to head (df27dc1).
⚠️ Report is 13 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #17510       +/-   ##
============================================
+ Coverage    81.75%   95.83%   +14.08%     
============================================
  Files          167      112       -55     
  Lines         9880     5095     -4785     
============================================
- Hits          8077     4883     -3194     
+ Misses        1657      212     -1445     
+ Partials       146        0      -146     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	95.83% <ø> (ø)

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