feat: fixture-backed write-yard-docs eval

[igmarin]

Why

ROADMAP item 1: only create-service-object had a starting tree. write-yard-docs/basic was four bullets, so baseline and context invented a class and the delta was noise.

What

• Undocumented PriceCalculator (self.call / #call, raises ArgumentError) plus standalone tests
• Task names the fixture files and required YARD tags
• Condensed skills/write-yard-docs/SKILL.md with a valid Ruby example
• Bench test: eval loads, no @param/@return/@raise yet, fixture tests pass, skill example ruby -cs

Proof

ruby evals/skills/write-yard-docs/basic/price_calculator_test.rb
# 3 runs, 0 failures

bundle exec ruby -Itest test/evals/write_yard_docs_basic_test.rb
# 4 runs, 0 failures

bundle exec rubocop
# 294 files, no offenses

One Herdr worktree (write-yard-docs eval). Did not fan out a second eval — this slice is one fixture.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between b4c2aae and 6ff32ec.

📒 Files selected for processing (8)

• CHANGELOG.md
• evals/skills/write-yard-docs/basic/criteria.json
• evals/skills/write-yard-docs/basic/price_calculator.rb
• evals/skills/write-yard-docs/basic/price_calculator_test.rb
• evals/skills/write-yard-docs/basic/task.md
• skills/write-yard-docs/SKILL.md
• test/evals/write_yard_docs_basic_test.rb
• test/evaluator/source_path_resolver_test.rb

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