feat: add Amazon Bedrock provider

[igmarin]

Why

ROADMAP item 3. Stacked on #109 (xAI). Uses Bedrock Runtime's OpenAI-compatible path so we do not add an AWS SDK.

What

• Clients::Providers::Bedrock
• https://bedrock-runtime.<region>.amazonaws.com/openai/v1/chat/completions
• Bearer auth: SKILL_BENCH_BEDROCK_API_KEY or AWS_BEARER_TOKEN_BEDROCK
• Region: SKILL_BENCH_BEDROCK_REGION or AWS_REGION (schema key location, default us-east-1)
• Default model amazon.nova-lite-v1:0
• skill-bench init --bedrock

Out of scope: IAM SigV4 signing.

Proof

bundle exec ruby -Itest test/evaluator/clients/providers/bedrock_test.rb
# 7 runs, 0 failures

bundle exec ruby -Itest test/evaluator/config/env_overrides_test.rb
# 4 runs, 0 failures

Base: feat/xai-provider (#109). Merge #109 first, then this.

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