feat: fixture-backed triage-bug eval

[igmarin]

Why

ROADMAP item 1: third extract-style eval. triage-bug/basic was four bullets, so the agent never saw a real bug.

What

• Discount.apply(cents:, percent:) uses cents / 100 * percent (999 cents at 10% → 90, should be 99)
• Starting test only covers 1000 cents (passes both formulas)
• Task is a bug report; agent must add a failing test before the fix
• Condensed skills/triage-bug/SKILL.md
• Bench test: fixtures exist, bug still present, starting tests pass, skill example ruby -cs

Proof

ruby evals/skills/triage-bug/basic/discount_test.rb
# 1 run, 0 failures

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

bundle exec ruby -Itest test/evaluator/source_path_resolver_test.rb
# 12 runs, 0 failures

Removed leftover Herdr worktree write-yard-docs eval (w2G). This slice lives in triage-bug eval.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 6a4d53f and 27c7557.

📒 Files selected for processing (7)

• CHANGELOG.md
• evals/skills/triage-bug/basic/criteria.json
• evals/skills/triage-bug/basic/discount.rb
• evals/skills/triage-bug/basic/discount_test.rb
• evals/skills/triage-bug/basic/task.md
• skills/triage-bug/SKILL.md
• test/evals/triage_bug_basic_test.rb

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