Infra: Support ARM-based Lambdas

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Description

Add support for ARM (Graviton2) based Lambda functions to reduce costs.

Tasks

• Add configuration for ARM architecture in Lambda definitions
• Test all runtimes on ARM
• Measure cold-start times on ARM vs x86
• Measure execution latency on ARM vs x86
• Document performance differences
• Decide on default architecture per runtime
• Update deployment configuration

Benefits

• ~20% cost reduction for ARM Lambdas
• Potentially better performance for some workloads

Considerations

• Ensure all dependencies are ARM-compatible
• Some runtimes may not support ARM yet

Acceptance Criteria

• ARM Lambdas are deployed and functional
• Performance benchmarks are documented
• Cost savings are measurable
• No regression in functionality