Pinning Claude Code to one AWS region: Mantle covers seven, classic Bedrock covers only London

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AWS published two concrete recipes on August 6 for regulated customers who need Claude Code inference to stay in a single region rather than merely in-geography, since cross-Region inference is the throughput-friendly default. Path one sets `CLAUDE_CODE_USE_MANTLE=1` plus `AWS_REGION` and pins models by plain ID (e.g. `anthropic.claude-opus-4-8`), with in-region support in Ireland, Stockholm, Tokyo, Melbourne, N. Virginia, Ohio, and Oregon. Path two uses classic Bedrock with application inference profile ARNs, but only eu-west-2 (London) currently supports Opus 4.6 and Sonnet 4.6 in-region.