Fix acts_as_tool_call message: option (#514)

[saurabh-sikchi]

What this does

Fixes cleanup_orphaned_tool_results ignoring custom association names configured via acts_as_tool_call message: and acts_as_message tool_calls: options.

The bug: When using custom association names like acts_as_tool_call message: :llm_message, the cleanup method called hardcoded .message and .tool_calls instead of the configured association names, causing NoMethodError.

The fix: Use message_association and tool_calls_association methods, which respect the configured names.

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation
• Performance improvement

Scope check

• I read the Contributing Guide
• This aligns with RubyLLM's focus on LLM communication
• This isn't application-specific logic that belongs in user code
• This benefits most users, not just my specific use case

Quality check

• I ran overcommit --install and all hooks pass
• I tested my changes thoroughly
  • For provider changes: Re-recorded VCR cassettes with bundle exec rake vcr:record[provider_name]
  • All tests pass: bundle exec rspec
• I updated documentation if needed
• I didn't modify auto-generated files manually (models.json, aliases.json)

API changes

• Breaking change
• New public methods/classes
• Changed method signatures
• No API changes

Related issues

#514

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.97%. Comparing base (8871844) to head (ae03ece).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
+ Coverage   80.95%   80.97%   +0.01%     
==========================================
  Files         114      114              
  Lines        5215     5215              
  Branches     1353     1353              
==========================================
+ Hits         4222     4223       +1     
+ Misses        993      992       -1     

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