build(deps): bump ruby_llm from 1.3.1 to 1.6.2

[dependabot]

Bumps ruby_llm from 1.3.1 to 1.6.2.

Release notes

Sourced from ruby_llm's releases.

1.6.2

RubyLLM 1.6.2: Thinking Tokens & Performance 🧠

Quick maintenance release fixing Gemini's thinking token counting and bringing performance improvements. Plus we're removing capability gatekeeping - trust providers to know what they can do!

🧮 Fixed: Gemini Thinking Token Counting

Gemini 2.5 with thinking mode wasn't counting tokens correctly, leading to incorrect billing calculations:

# Before: Only counted candidatesTokenCount (109 tokens)
# Actual API response had:
#   candidatesTokenCount: 109
#   thoughtsTokenCount: 443
#   => Should be 552 total!
Now: Correctly sums both token types
chat = RubyLLM.chat(model: 'gemini-2.5-flash')
response = chat.ask('What is 2+2? Think step by step.')
response.output_tokens  # => 552 (correctly summed)

This aligns with how all providers bill thinking/reasoning tokens - they're all output tokens. Fixes #346.

🚫 Capability Gatekeeping Removed

We were pre-checking if models support certain features before attempting to use them. But sometimes pre-emptive checks were getting in the way:

# Before 1.6.2: Pre-checked capabilities before attempting
chat.with_tool(MyTool)  # => UnsupportedFunctionsError (without trying)
Now: Let the provider handle it
chat.with_tool(MyTool)  # Works if supported, provider errors if not

Why this approach is better:

• Direct feedback - Get the actual provider error, not our pre-emptive block
• Immediate support - New models and features work as soon as providers ship them
• Custom models - Fine-tuned and custom models aren't artificially limited
• Simpler flow - One less layer of validation between you and the provider

The provider knows what it can do. If it works, great! If not, you'll get a clear error from the source.

Same philosophy applies to structured output (with_schema).

⚡ Performance Improvements

Thanks to @​tagliala for introducing RuboCop Performance (#316), bringing multiple optimizations:

... (truncated)

Commits

• 470de29 Bump version to 1.6.2
• 14b352f Fixes incorrect token counting for Gemini with thinking
• f54c6cd Remove model existence logging after capability gatekeeping removal
• acb953a Updated Appraisals
• 92bcdd5 docs: remove capability gatekeeping
• 836113f Remove capability gatekeeping - let providers validate their own features
• ccd7915 Introduce RuboCop Performance (#316)
• ee0d8c2 Bust gem version cache in README
• b2855b4 fix: skip flaky test for orphaned tool call messages on JRuby
• 91eb158 Appraisal update
• Additional commits viewable in compare view

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[dependabot]

Superseded by #41.